The National Park Service, Interior Department, is constantly issuing
special publications that deal with particular phases of one or more
National Parks. A bibliography may be had from the Department of the
Interior giving a pretty complete list of all books, pamphlets, and
magazine articles which contain information concerning any one or all
National Parks. There are also a number of government publications
which touch upon special phases of plant and animal life and geology.
All issues of the _Sierra Club Bulletin_, _Mazama_, and _The
Mountaineer_, contain more or less interesting matter that pertains to
one or more National Parks.