OTHER FUELS
WOOD
Wood, which was formerly the only fuel used in this country, has now
largely given place to other fuels. In rural districts and in lumber
regions it is still used extensively; but in the cities, larger towns,
and manufacturing regions, it is not used in commercial quantities. Its
use for power production is limited to the wood-working factories which
have a large amount of waste lumber and which employ this by-product to
furnish heat for steam boilers.
The wood used for fuel or for power usually represents what would
otherwise be lost, the dead trees and the unmarketable timber of the
farmer's wood-lot, the refuse of lumber regions or the waste of
wood-working factories. So that the use of wood as fuel now generally
means the conservation of our coal supply, and a use for the low-grade
parts of the forest.
In some cases, however, farmers cut for fuel fine young trees that
would grow into excellent timber. Liberal planting of trees so that wood
shall become plentiful in all parts of the country will tend to bring
about again a larger use of wood as fuel, which will thus once more
become a factor in the saving of our coal. Every farmer should learn to
save all valuable trees for lumber, and to use only undesirable ones for
fuel.
PEAT
Peat is said by geologists to be only "coal in the making," carbon that
is in the state of changing from vegetable matter to coal. It is
probable that in the course of centuries this would become coal, and in
its present state it has many of the properties of coal, though it has
not nearly so high a heating value.
In this country we have had such a wealth of fuel resources--coal, wood,
oil, and gas--that up to the present time we have done little to develop
our peat beds, although in European countries ten million tons are used
annually for fuel, as well as large quantities for other purposes. From
the earliest times peat has been the principal fuel of the common people
of Ireland and some of the countries of northern Europe.
Now, however, people are trying to make the best of many resources not
heretofore developed, coal prices are steadily advancing and the two
causes combine to turn people's attention to the peat beds of America.
One point that is worthy of notice is that peat is found mostly in
regions where there is no coal, oil, or natural gas. The development of
peat beds in those regions, it will be seen, would give them a great
advantage in the matter of cheap fuel.
Large peat beds are found in Minnesota, Wisconsin, Michigan, New York,
New England, New Jersey, Florida, the Dakotas, northern Iowa, Illinois,
Indiana, Ohio, Pennsylvania, eastern Virginia, the Carolinas and
Georgia; and near the coast in the gulf states, and a narrow strip along
the Pacific coast, from southern California to the Canadian border. They
cover an area of about 11,000 square miles and are supposed to contain
not less than 14,000,000,000 tons of air-dried peat. At the rate of
three dollars per ton, which is a reasonable price in the states having
no coal, this peat would have a value of more than $40,000,000,000.
Peat is prepared for use as common fuel in two ways: (1) By cutting it
into blocks or bricks, which are air-dried by exposure to sun and wind
for a few weeks. This is called "cut peat," is bulky and easily
breakable, and can be used only for local consumption. (2) By digging
either by hand or machine, and grinding it in a mill. It is put in wet,
ground, cut with rapidly turning knives, and passed out of the machine
as a thick pulp that is cut into bricks as it comes out. It is then
stored several weeks until thoroughly dried. This is called "machine
peat," "pressed peat," or "condensed peat."
Peat is being used in many ways. (1) Air-dried peat is used for fuel
only. (2) Dry peat without a binder, or mixed with coal dust and tar or
pitch is used for the same purpose. (3) Machine peat is used for many
purposes, among them making into briquettes, peat charcoal, and peat
coke.
It has been found practical to make illuminating gas of peat, but a far
more general use is for running gas-engines and producer-gas furnaces.
This is a practical use for it, since it will conserve the coal now used
for that purpose, furnish satisfactory power without smoke or dirt,
provide cheap power in regions that have no coal mines, and lastly may
be made to yield valuable by-products: ammonia, acetic acid, paraffin,
tar, creosote, and wood-alcohol. If all the peat in the United States
could be used in producer-gas engines the ammonia yielded would alone
have a value of $36,000,000,000.
Peat is also used for packing material, as a fertilizer, for
manufacturing paper, for coarse cloth and mattress filling. By mixing
wet machine peat with cement it may be made into blocks for paving and
other construction work. The most promising uses are for fuel, as
bedding for stock, as a disinfectant, in briquettes for burning lime,
brick, and pottery, in which it is finding a large use, and for which it
is said to be particularly well fitted; and most satisfactory of all,
its use in gas-producer engines. In Florida an immense plant is being
built to manufacture electric power, using air-dried peat as fuel, the
power to be transmitted to Jacksonville.
Machine peat is supposed to have sixty-five per cent. the value of the
same weight of Pocahontas coal, but on account of the lack of waste in
peat its real value is higher than would appear from the comparison.
From two to two and a half pounds will produce one horse-power per hour
in gas-producer engines. By this estimate, we can see that the peat beds
of this country, if properly used, may be largely employed, either now
or in the future, as a substitute for the vanishing coal.
NATURAL GAS
Of all the fuels, natural gas may be said to be the ideal one. Coming
from the ground, it is piped a greater or less distance and distributed
to the home or factory for light, heat, or power; for all of which it is
equally desirable. It is ready for our use at the turn of a key, is
absolutely clean, having neither dust, ash, nor unconsumed portions. It
requires no kindling other than a lighted match.
Natural gas is found over an area which, if combined, would cover almost
10,000 square miles. It exists in twenty-two states--Alabama,
California, Colorado, Illinois, Indiana, Michigan, Missouri, Montana,
New York, Kansas, Kentucky, Louisiana, Ohio, Oklahoma, Oregon,
Pennsylvania, South Dakota, Texas, Utah, Washington, West Virginia,
Wyoming. In some of them the area has been large and the production very
heavy, in others the field is small and unproductive. Until the last two
or three years there have been no statistics as to the quantity of gas
piped, but an account of its value has been kept for many years. For the
twenty years beginning with 1888 the value is given at nearly
$500,000,000.
It must be remembered that much of this represents extremely low prices,
only the amount actually paid for its use. When gas is newly discovered
in a region it is not considered an opportunity for the residents of the
community to have cheap light, power and fuel for themselves, but
instead as an opportunity to develop the country, to increase the
population and attract new factories. In order to advertise and boom
their communities free gas is usually offered to factories. So in
dozens of instances large factories have been operated for years without
a cent having been paid for fuel. For this reason no proper estimate can
be made of the quantity of gas consumed, nor of its value even at a
nominal price. In 1907, (the last year for which complete returns have
been published in government reports) the amount of gas consumed was
given at 404,000,000 cubic feet, which at present prices is valued at
$63,000,000.
It is impossible to determine in any way the future production of
natural gas, or to guess at the quantity remaining in the earth. It may
be much less or much more than present conditions would indicate; but
the present known fields are limited, and the pressure is growing
steadily less in all of them.
The Conservation Commission reports, "It is safe to predict that the
known fields will be exhausted in twenty-five years." The decrease of
natural gas is strikingly illustrated in Indiana. This state, perhaps
more than any other, profited directly by the discovery of its natural
gas about twenty years ago. Here, the mineral maps show, is by far the
greatest natural gas region in the United States. With the discovery of
natural gas, established towns grew to ten times their former size and
new ones sprang up everywhere. Indiana, which had been chiefly an
agricultural state, bade fair to become one of the foremost
manufacturing states on account of its cheap and abundant fuel. In 1902
Indiana produced nearly $8,000,000 worth of natural gas, but for 1908
the State Geologist's report contained no figures for this product. It
had ceased to be a prominent factor in the wealth of the state! There is
no resource that has been so shamefully, so hopelessly wasted as our
natural gas.
With even more recklessness than characterizes the waste of our forests
and our coal, we have allowed this perfect fuel to escape. To the
dwellers in each region where natural gas is found, it seems that the
supply is inexhaustible. The roar of the wells, which makes the very
earth tremble; the flames springing high into the air; the undiminished
pressure after months of use, appearing to indicate a boundless
reservoir below; the opportunity for whole communities to grow rich by
its use; all these things tend to promote recklessness on the part of
all who handle it. In the beginning the wells are usually not tightly
cased, and there is a considerable quantity of gas escaping about every
well. New wells are frequently lighted to show the volume of gas. In
some cases the well has become uncapped on account of heavy pressure and
to prevent the escape of unconsumed gas into the air it is kept burning
night and day. The strongest wells are often kept burning for months in
order to advertise a new gas field. In this way immense quantities of
the most perfect fuel in the world have been wantonly wasted. From a
single well in eastern Kentucky there flowed a steady stream of gas for
twenty years which at present prices would be worth $3,000,000, and the
same story of waste from burning wells comes from every natural gas
field.
In a new region where gas is abundant there is also a great waste from
leaking pipe lines laid on the surface of the ground, from open
flambeaux, and from careless home and factory consumption. In many
communities the open flambeaux have been employed to light the streets,
and allowed to burn day and night to avoid the expense of a man to care
for them. Where natural gas is abundant, meters are not usually
installed; instead, gas is sold by the month. The consumer is under no
obligation to save the gas, in fact, he usually acts on the common
American principle of wanting to get all he can for the money and so
burns his open tip lights, and open burner stoves day and night. The
factories waste in the same way, using open furnaces which are never
banked during the season because it is easier and costs no more.
This, it seems, should be the whole history of natural gas waste, but
the greatest source of loss still remains to be spoken of. In every gas
region of any importance oil is found sooner or later, usually after the
heaviest gas pressure has been exhausted; and the oil driller is the
greatest of all foes to the life of a natural gas region. He finds that
the gas interferes with the flow of oil, spraying it into the air and
causing loss, and that the danger of fire is much increased by its
presence. This frequently causes explosions, tearing out the side of the
well or blowing out the casing, and making the oil-well useless. The
surplus gas is usually piped to one side out of the reach of danger, and
then burned to get rid of it. Drillers often try to force the gas out in
the hope that it will be followed by a rush of oil.
This is the heaviest drain on the gas. In the Caddo field in Louisiana
alone the loss is seventy million cubic feet per day, enough to light
ten cities the size of Washington, D. C., and equal to ten thousand
barrels of petroleum per day. In Indiana a few years ago fourteen wells,
all within a space of a few acres in extent, were burned by oil drillers
continuously for six months, the light being visible twenty miles away.
Greater care in the management of the wells and slight additional
expense for casing are all that is required to stop the waste of gas
from oil wells and heavy pressure gas wells.
All of these wastes taken together constitute a fearful loss. In 1907,
more than 400,000,000 cubic feet were used and an almost equal number
wasted. In other words, the daily waste is over a billion cubic feet, or
enough to supply every city in the United States of over one hundred
thousand population.
The heating value of a billion feet of gas is equal to a million bushels
of coal. If some great conflagration were sweeping away our coal fields
steadily every day in the year, and destroying our best coal at the rate
of a million bushels per day, how quickly we should all arise to aid in
checking it! And yet this imaginary case is actually true in regard to
the best fuel in this country, which is burning uselessly an equal value
in coal, and our coal must some day be used to supply the loss.
We are apt to ignore the greatness of this loss because the gas escapes
into the air and we can not see it, or it burns and we see only its
effect, not the loss of fuel, but if we could see it in the form of oil
we should find that a billion feet of gas is equal to more than a
hundred and sixty thousand barrels of petroleum. Think of it, the
equivalent of one hundred and sixty thousand barrels of oil, for which
no price is paid and of which no use is made, for ever destroyed every
day in every year! Would the oil companies permit it? Would we not all
assist them in saving their property from destruction, and shall we not
ask of them equal help in saving the fuel that in turn conserves our
coal supply? Little objection can be made to the present method of using
gas in the older regions. The waste in domestic use is comparatively
small. Much is used for lighting with incandescent burners, and asbestos
grates and gas ranges have replaced the open-burner stoves and grates.
These are all efficient methods of use, and but little could be done in
the way of further conservation. In factories the gas-engine is in many
instances replacing the open furnace, which requires many times as much
gas to produce an equal amount of power. They should be used in every
factory, and gas companies should also require the use of the best
devices for saving gas in places where meters are not used.
Until last year but one state--Indiana--had an effective law preventing
the waste of natural gas by oil companies. This law says in substance
that a man can not take the oil from the ground where nature has safely
stored it, unless he also provide a market for the gas which accompanies
it. It also says that neither the producer nor the consumer shall be
allowed to waste this valuable fuel, as such waste is against public
policy.
Mr. I. C. White, of West Virginia, in discussing this question at the
Conservation Congress said, "This Indiana statute should be enacted into
law in every state where these fuels exist." Since that time
Pennsylvania and Ohio have passed laws, which are said to be effective,
for the conservation of natural gas.
Much has been accomplished by gas companies, who, since they became
alive to the danger of loss of their investment, have been extremely
watchful of their property. In West Virginia the gas companies buy the
gas which has been obtained in the drilling of oil wells, thus providing
a market for the waste gas and making it possible to continue the oil
business and at the same time to furnish cheap gas.
Another hopeful sign is the pumping of all of the product of a well.
Formerly as soon as a well dropped greatly in production it was
abandoned, but now it is pumped until dry.
One method by which the gas from oil wells may be utilized consists in
compressing it in steel cylinders for shipping. This in a small way has
been found to be successful.
Experiments are being tried on a large scale in Ohio to prove that gas
may be returned to reservoirs within the earth which are tight enough to
hold it under heavy pressure.
Fuel gas made from low-grade coal is a satisfactory substitute for
natural gas. Like the natural product it may be piped for long
distances. Some natural gas companies have bought up the culm banks and
heaps of refuse coal, so that if the natural gas becomes exhausted they
can manufacture cheap gas at the mines and pipe it to the cities they
now serve.
PETROLEUM
Petroleum, or rock oil, is a dark greenish brown liquid which when
refined yields gasolene, naphtha, benzine, kerosene, lubricating oils,
and paraffin. The name petroleum applies only to the crude petroleum as
it comes from the ground, and the word oil is applied to the products
obtained by refining.
The early history of the petroleum industry in this country is
interesting as showing what great results spring from small beginnings.
From salt wells in Pennsylvania there was an occasional flow of
petroleum, but it had had no commercial value. Samuel Kier, of
Pittsburg, had salt wells at Tarantum from which he had accumulated so
much petroleum (fifty barrels) that he decided to try to dispose of it,
but there was no market. No one knew what to do with it. He then partly
refined it, making a poor quality of kerosene, and introduced a lamp
with a chimney. This proved so popular that A. C. Ferris, also of
Pittsburg, undertook to sell this in other cities, and these two men
not only sold the fifty barrels and the other petroleum that accumulated
from the salt wells, but they had created such a demand for the new
light that they could not supply enough oil, and in 1859 Colonel Drake
drilled at Titusville the first well solely for petroleum. In the
half-century since that time nearly two billion barrels, or almost two
hundred and fifty million tons, worth one and three-quarter billion
dollars, have been produced.
Petroleum is now mined, or drilled, in many countries besides the United
States, but the United States furnishes sixty-three barrels out of every
hundred produced in the world. Russia produces twenty-one barrels,
Austria four, and the East Indies three barrels, Roumania two, India and
Mexico one each, Canada, Japan, Germany, Peru, and Italy each less than
one barrel; so we can see that the United States is the one great
producer of petroleum, and that it is to this country that we must look
for the principal world supply for the present, and as far as known, for
the future. Let us see, then, what we may expect the United States to do
to supply this demand.
The known petroleum lands cover an area of about 8,500 square miles and
are in six large fields and several smaller ones. The largest and best
is the Appalachian, of which the best known is the Pennsylvania field.
It has a grade of petroleum that differs from any other thus far found
in the world. It is most easily converted into kerosene or lamp oil, and
contains a larger proportion of such oil. It is the finest petroleum in
the world, except that found in Indiana and Ohio, and that costs more to
refine.
The Appalachian field includes, besides Pennsylvania, western New York,
West Virginia, a narrow strip in eastern Ohio, Kentucky and Tennessee.
These southern oils are of a much lower grade, but are better than the
Russian or other foreign oils.
The next great field is called the Lima-Indiana, and covers a
considerable portion of northwestern Ohio and eastern Indiana. This
petroleum contains less gasolene and less lamp oils, and more sulphur,
which makes refining difficult. The Illinois field lies next. Here, in a
strip about thirty miles long and six miles wide on an average, an
enormous quantity of petroleum is produced. This oil is slightly lower
in quality and contains considerable asphalt.
The mid-continent field lies in Kansas and Oklahoma. This petroleum also
contains asphalt and other chemical products. Such immense amounts are
produced here that it has not been possible to care for all of it,
either in the matter of storage tanks or cars for transporting it, and
as a result large amounts have been wasted. In Oklahoma within a space
of less than two square miles one million barrels of forty-two gallons
each of petroleum were wasted in the year 1906.
The Gulf field lying in Texas and Louisiana has been developed entirely
since 1901. The first well was drilled near Beaumont, Texas, as an
experiment to determine whether oil could be found. Small storage tanks
were provided and it was hoped to find oil enough to make drilling
profitable. The well proved to be a "gusher" of such magnitude that
before sufficient tanks could be provided, or the flow checked, more
than half a million barrels were wasted on the ground.
The Gulf petroleum contains a large amount of asphalt and a small amount
of gasolene and lamp oil. It has been used principally for burning as
crude oil in locomotives and has sold as low as ten cents per barrel;
but lately methods of refining have been perfected which produce good
lubricating oil and a gasolene of high value from these low-grade oils.
The last great field is found in California. The oil is similar to the
Gulf oil, and investigation has shown that the quantity is greater in
this field than in any other. It is used largely for fuel and power on
account of lack of other fuels in that region.
In addition to these fields there are small ones in Colorado and
Wyoming, and promises of fields in New Mexico, Utah, Idaho, Montana,
Oregon and Washington.
Estimates of the amounts of petroleum yielded are made by computing the
amount usually produced per acre, which varies from eight hundred
barrels produced in Pennsylvania, to eight thousand barrels per acre
produced in Illinois. In most of the fields it is about a thousand
barrels per acre. Even then the amount is extremely difficult to
estimate. The Geological Survey concludes that the lowest probable
calculation of the entire amount stored in the rocks of the United
States is ten billion, and the highest a little less than twenty-five
billion barrels. The last report officially published shows that we are
producing one hundred and seventy million barrels per year. If the same
rate of production continues, we might expect our petroleum to last from
fifty-five to one hundred and thirty-five years, according to the amount
found; but tables of statistics show that throughout the life of the
petroleum industry, as much has been produced each nine years as the
entire product before that time. For example, up to the present, we have
produced one billion eight hundred million barrels and if the present
rate continues, in the next nine years alone we shall produce an equal
quantity again. The causes of such rapid growth are many. One is the
great increase in the use of some of the products, such as gasolene,
which has increased many fold since the automobile became popular.
Another, and the greatest cause, is the ease with which any quantity of
oil can be sold for cash at any time, and at prices much above the cost
of production.
Another reason is based upon the nature of the product. In pumping from
one well oil is apt to flow in from other leases, under other farms, and
exhaust them without the holders of those leases having received any
compensating benefit. It is therefore necessary for each lessee to get
his share before it flows away. Under these circumstances, it is
impossible to prevent an entire field from being drilled over very
rapidly, unless there is a combination of all the interests; or unless
the law limits the amount that each producer shall extract per acre
within a given time.
Pennsylvania and New York have declined to one-third their former value
and yet it is only seventeen years since they reached their highest
point. This would seem to indicate that the life of that field will not
exceed ten years. West Virginia is producing only a little more than
half its former yield and is rapidly declining. Ohio and Indiana are
declining more rapidly than Pennsylvania. Texas is also in the rapidly
declining class, and in Kansas the production is only a fraction of
what it was formerly. On the other hand, Illinois, Oklahoma, and
California can be expected to increase steadily for several years.
Taking into account all these factors, it is estimated that the entire
supply now known to exist would be exhausted before the middle of the
present century. It appears more probable, however, that increasing
prices long before that time will help to conserve the supply; and that
petroleum will be produced for a long time to come, though not in
sufficient quantities for industrial and general use.
The principal uses of petroleum are for burning as crude oil in furnaces
and under boilers, particularly in locomotives. The refined products
have various uses. Probably the most important is the lubricating oil.
This is necessary in the development of all kinds of power. At least
one-half pint of lubricating oil is used for every ton of coal consumed
for power. All engines, all street and steam railways, steamships,
sewing-machines, clocks, watches, and automobiles, in fact all operating
machinery requires its use; so that a large amount of oil must always be
conserved for lubricating purposes.
Coal oil, or kerosene, may be regarded as absolutely necessary for the
lighting of houses or other establishments not connected with gas or
electric supply.
Gasolene is sometimes used for lighting, though such use is not common.
It is largely used for cooking, and still more largely used in the
various types of gasolene engines.
Naphtha is used for power, especially for motor-boats, and for cleaning,
in which it is very valuable by reason of its power to dissolve dirt.
Paraffin is used in polishing, in laundry work, for waxing floors, and
as a covering to exclude air in preserving articles.
Waste has been markedly absent in the petroleum industry. It is
necessary that oil drilling outfits shall contain steel storage tanks
for holding the oil when it is reached. Usually the supply is large
enough, but sometimes, as in the case of the big well at Beaumont,
Texas, the oil gushes forth in such volume that the drillers are not
prepared to take care of the overflow, and much is wasted before the
well can be capped. In general there is no waste in storage in this
country. In European countries where there is oil, the loss through lack
of tanks and by using wooden tanks which leak, is very great.
Another form of waste which is common in foreign countries, but which
has been avoided in the United States, is evaporation of gasolene and
similar light products when the petroleum is exposed to the air in open
tanks. This is the most valuable part of petroleum, and if it be exposed
to the sun a single day it loses greatly in value.
The refining processes of the petroleum industry are probably carried
out with better system and less waste than in any other resource, owing
to the fact that the business is controlled by large companies. There is
no waste material in its manufacture, except some slight residue that
might be used for oiling roads, instead of using the crude oil. The
principal waste lies in its use. In view of the fact that the supply is
not unending, is, indeed, rapidly disappearing, the uses should be
confined only to the necessary lines for which there are no substitutes
at similar prices. These are for lubricating oils and for the lighting
of homes. The unnecessary uses are for burning in locomotives and for
the development of power.
Whenever new petroleum fields are opened up, there is a corresponding
drop in price. In order to dispose of it quickly such petroleum is
usually sold for the lowest grade uses, and the price for this crude
petroleum is not more than one hundredth as much as for high grade
petroleum products. The report of the National Conservation Commission
is so excellent that it is quoted almost word for word.
"At present more petroleum is being produced than is necessary for the
demands of the industry. Within ten years the present fields will be
unable profitably to produce enough for these requirements. The only
direction in which production can be checked is with the petroleum
contained in public lands.
"Offering such public lands for entry at a low price is nothing more
than temptation to the private citizen to waste petroleum by over
production, since lands yielding hundreds of dollars per acre in this
product can be obtained for a small sum. Every acre of public land,
believed to contain petroleum or natural gas, should be withdrawn from
public sale and leased under conditions that regulate production.
"Its use for power is justified on the Pacific coast, if used in
gas-producer engines."
ALCOHOL
As a substitute for other fuels, wood, or denaturated alcohol, will
probably come into greater use each year, and is regarded by many as the
great fuel of the future, because the materials of which it is made are
waste vegetable products and will always be plentiful.
It is made from cellulose, the woody part of plants, and may be
manufactured from sawdust when freshly cut from live trees, from small,
and refuse potatoes, from inferior grain that is not worth marketing,
and from low-grade fruits and vegetables of all kinds. It is even said
that the hundreds of acres of sage-brush in the West that have always
been considered worse than useless can be made into wood-alcohol and
thus become a valuable product.
It can be used for any purpose that gasolene can, although a different
style burner is required. It must be made much hotter before it is
changed into vapor, and on account of this it has been difficult to make
satisfactory burners for all the kinds of heating, lighting, and power
work; the machinery being far from perfect as yet. Wood-alcohol can not
yet be made cheaper than gasolene, and is not so easy to burn, so that
it is slow in reaching an important place in the industrial world; but
gas and gasolene prices will advance, and better methods of
manufacturing and burning alcohol will be found, and then we shall have
a fuel that can take the place of either coal or petroleum for lighting
or power.
It is thought that wood-alcohol will be of especial use to the farmer,
since he has so many waste vegetable products, has so much need of power
in small quantities and is far from the sources of public service
power, such as electric and gas plants. Alcohol-driven motors can be
used to take the place of the labor of both horses and men on the farm.
On level farms they can run the heavy machines, such as mowers, reapers,
and binders, plows and cultivators. On any farm they may be used to run
stationary engines, to chop and grind food for live stock, to pump
water, churn, run sewing-machines, operate fans, drive carriages and
wagons and do many other things.
Wood-alcohol produces ammonia as a by-product, is used in the
manufacture of dyes and coal-tar products, of smokeless powder, of
varnishes, and of imitation silks made from cotton.
REFERENCES
Report National Conservation Commission.
Reports of Geological Survey.
Conservation of Ores and Related Minerals. (Carnegie.) Report Governor's
Conference.
Conservation of Mineral Resources. (U. S. Government Report.)
Industrial Alcohol and Its Uses. W. H. Wiley. Bulletin, 269.
Production of Peat in the U. S. in 1908. U. S. Government Reports.
Production of Oil in the U. S. in 1908.
Production of Gas in the U. S. in 1908.
Waste of Our Fuel Resources. (White.) Report Governor's Conference.