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12
Bryant, Bruce, 1930-
8
Geological Survey (U.S.)
2
Freeman, Val L., 1926-
2
Godwin, Larry H.
1
Campbell, David L.
1
Colorado. Department of Highways. Planning and Research Division
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1
Gaskill, David L.
1
Geological Survey (U.S.),
1
Ludington, Steve
1
Mutschler, Felix E.
1
Ruleman, C. A.
1
Yeoman, R. A.
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