Alden, W. C., 1932, Physiography and glacial geology of eastern Montana
and adjacent areas: U. S. Geological Survey Professional Paper 174,
133 p.
Bluemle, J. P., 1977, The face of North Dakota—the geologic story: North
Dakota Geological Survey Education Series 11, 73 p.
Colton, R. B., Lemke, R. W., and Lindvall, R. M., 1961, Glacial map of
Montana east of the Rocky Mountains: U. S. Geological Survey
Miscellaneous Geologic Investigations Map I-327.
Colton, R. B., Lemke, R. W., and Lindvall, R. M., 1963, Preliminary
glacial map of North Dakota: U. S. Geological Survey Miscellaneous
Geologic Investigations Map I-331.
Curtis, B. F., ed., 1975, Cenozoic history of the southern Rocky
Mountains—Papers deriving from a symposium presented at the Rocky
Mountain Section meeting of the Geological Society of America,
Boulder, Colorado, 1973: Geological Society of America Memoir 144,
279 p.
Darton, N. H., 1905, Preliminary report on the geology and underground
water resources of the central Great Plains: U. S. Geological Survey
Professional Paper 32, 433 p.
Flint, R. F., 1955, Pleistocene geology of eastern South Dakota: U. S.
Geological Survey Professional Paper 262, 173 p.
Frye, J. C., and Leonard, A. B., 1965, Quaternary of the southern Great
Plains, _in_ Wright, H. E., Jr., and Frey, D. G., eds., The
Quaternary of the United States—A review volume for the 7th Congress
of the International Association for Quaternary Research: Princeton
University Press, p. 203-216.
Howard, A. D., 1958, Drainage evolution in northeastern Montana and
northwestern North Dakota: Geological Society of America Bulletin,
v. 69, no. 5, p. 575-588.
Johnson, R. B., 1961, Patterns and origin of radial dike swarms
associated with West Spanish Peak and Dike Mountain, south-central
Colorado: Geological Society of America Bulletin, v. 72, no. 4, p.
579-590.
Judson, S. S., Jr., 1950, Depressions of the northern portion of the
southern High Plains of eastern New Mexico: Geological Society of
America Bulletin, v. 61, no. 3, p. 253-274.
Keech, C. F., and Bentall, Ray, 1971, Dunes on the plains—The Sand Hills
region of Nebraska: Nebraska University Conservation and Survey
Division Resources Report 4, 18 p.
Lemke, R. W., Laird, W. M., Tipton, M. J., and Lindvall, R. M., 1965,
Quaternary geology of northern Great Plains, _in_ Wright, H. E.,
Jr., and Frey, D. G., eds., The Quaternary of the United States—A
review volume for the 7th Congress of the International Association
for Quaternary Research: Princeton University Press, p. 15-27.
Mansfield, G. R., 1907, Glaciation in the Crazy Mountains of Montana:
Geological Society of America Bulletin, v. 19, p. 558-567.
Pettyjohn, W. A., 1966, Eocene paleosol in the northern Great Plains,
_in_ Geological Survey research 1966: U. S. Geological Survey
Professional Paper 550-C, p. C61-C65.
Robinson, C. S., 1956, Geology of Devils Tower National Monument,
Wyoming: U. S. Geological Survey Bulletin 1021-I, p. 289-302.
Smith, H. T. U., 1965, Dune morphology and chronology in central and
western Nebraska: Journal of Geology, v. 73, no. 4, p. 557-578.
Stormer, J. C., Jr., 1972, Ages and nature of volcanic activity on the
southern High Plains, New Mexico and Colorado: Geological Society of
America Bulletin, v. 83, no. 8, p. 2443-2448.
Strahler, A. N., and Strahler, A. H., 1978, Modern physical geography:
New York, John Wiley & Sons, 502 p.
Thornbury, W. D., 1965, Regional geomorphology of the United States: New
York, John Wiley, 609 p.
Wright, H. E., Jr., 1970, Vegetational history of the Central Plains,
_in_ Pleistocene and recent environments of the central Great
Plains: Kansas University Department of Geology Special Publication
3, p. 157-172.