Author
Geological Survey (U.S.)
13
United States. Bureau of Mines
United States. Bureau of Land Management
12
Diggles, M. F.
3
Bergquist, Joel R.
2
Evans, James George, 1938-
2
King, Harley D.
2
Calzia, J. P.
1
Campbell, Harry W.
1
Conrad, James E.
1
McHugh, Edward L.
1
Minor, Scott A.
1
Pickthorn, William J.
1
Sawlan, Michael G.
1
Vander Meulen, Dean B.
1
Winters, Richard A.
1