Author
Geological Survey (U.S.),
156
Geological Survey (U.S.)
110
Johnson, Ronald C. 1950-
9
United States. Department of Energy
9
Wolfe, Jack A., 1936-
8
Geological Survey of Wyoming
7
Colorado Geological Survey
6
Hansen, Wallace R., 1920-
6
University of Wyoming. Department of Geology
6
Woodring, W. P. 1891-1983
6
Woodring, W. P. 1891-1983,
6
Dickinson, Kendell A., 1931-
5
Keefer, William R., 1924-
5
Knowlton, Frank Hall, 1860-1926,
5
MacNeil, F. Stearns 1909-
5
Moore, Ellen James
5
Addicott, Warren O.,
4
Du Bray, E. A.
4
Kentucky Geological Survey
4
Moore, Ellen James,
4
Puerto Rico. Department of Industrial Research,
4
Ambrose, Carol Morgans Tremain
3
Bartow, J. Alan
3
Carr, Wilfred James, 1926-
3
Case, James E., 1933-
3
Clark, William Bullock, 1860-1917
3
Darton, Nelson Horatio, 1865-1948
3
Diller, J. S. 1850-1928
3
Ketner, Keith B., 1921-2019,
3
Knowlton, Frank Hall, 1860-1926
3
Nichols, Douglas J.
3
Nilsen, Tor Helge
3
Nilsen, Tor Helge,
3
Owens, James Patrick, 1924-
3
Poore, Richard Z.
3
Poore, Richard Z.,
3
Puerto Rico. Department of Industrial Research
3
Rau, Weldon W.
3
Roberts, Stephen B.
3
Snavely, P. D. 1919-2003
3
Stanley, Richard G.
3
Sweetkind, Donald S.
3
United States. Bureau of Indian Affairs
3
White, Charles A. 1826-1910
3
White, Charles A. 1826-1910,
3
Addicott, Warren O.
2
Alpha, Andrew G.,
2
Anderson, John J. 1930-
2
Anderson, R. Ernest
2
Bader, J. W.
2
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