- Geological Survey (U.S.)9
- Pillmore, C. L., 1930-4
- Detterman, J. S.2
- Hackman, Robert J.2
- Peterson, Fred, 1933-2
- Bennett, H. S.1
- Cashion, W. B. (William Bryan), 1923-1
- Kent, Bion H. (Bion Huntley), 1925-1
- Sargent, Kenneth A.1
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