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