Author
Colorado Geological Survey
12
Cappa, James A.
11
Carroll, Christopher J.
4
Hemborg, H. Thomas
4
O'Keeffe, Michael K.
4
Ambrose, Carol Morgans Tremain
3
Colorado. Division of Minerals and Geology
3
Berry, Karen
2
Guilinger, Jim
2
Keller, John W. 1964-
2
Burnell, James R.
1
Colorado Geological Survey. Division of Minerals and Geology
1
Colorado Geological Survey. Mineral and Mineral Fuels Section
1
Colorado. Bureau of Mines
1
Eakins, Wynn
1
Geological Survey (U.S.)
1
United States. Bureau of Mines
1
Young, Genevieve B. C.
1