Author
Campbell, John A. 1930-
1
Colorado Geological Survey
1
Colorado. Office of State Geologist
1
Dale, T. Nelson 1845-1937
1
Darton, Nelson Horatio, 1865-1948
1
Denver Civic and Commercial Association
1
Evans, William Gray, 1855-1924
1
Four Corners Geological Society
1
Four Corners Geological Society. Field Conference
1
Four Corners Geological Society. Field Conference 1987)
1
Geological Survey (U.S.)
1
George, Russell D., 1866-
1
Heald, K. C. 1888-1971
1
Marshall, R. B. 1867-1949
1
Martin, G. C. 1875-1943
1
Schaller, Waldemar T. 1882-1967
1
United States. Bureau of Reclamation
1
United States. Department of the Interior,
1