Author
Geological Survey (U.S.)
21
Abston, C. C.
1
Alberts, Mark
1
Berkey, Richard L.
1
Buttleman, Kim
1
Grand Junction Geological Society
1
Hoffman, J. D.
1
Ives, J. C.
1
Lavender, David, 1910-2003
1
McGregor, Joseph K., 1950-
1
McKinney, Kevin C.
1
Newberry, J. S. 1822-1892
1
U.S. Geological Survey Photographic Library
1
United States. Office of Explorations and Surveys
1
United States. War Department. Corps of Engineers
1