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Author
- Geological Survey (U.S.)43
- Detterman, J. S.15
- Hackman, Robert J.13
- Sable, V. H.9
- Marshall, C. H.6
- Miller, Calvin F.6
- Bates, C. E.5
- Bennett, H. S.5
- Kent, Bion H. (Bion Huntley), 1925-5
- Orkild, Paul P.5
- Condon, W. H. (William H.)2
- Platt, J. N.2
- Reed, John Calvin, 1930-2
- Bergquist, W. E.1
- Cass, John T.1
- Hemphill, William R. (William Ross), 1930-1
