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Author
- Geological Survey (U.S.)29
- Hackman, Robert J.23
- Marshall, C. H.6
- Orkild, Paul P.6
- Miller, Calvin F.5
- Detterman, J. S.4
- Sable, V. H.4
- Tolbert, G. E.4
- Bennett, H. S.3
- Platt, J. N.3
- Bates, C. E.2
- Cross, Whitman, 1854-19492
- Olson, A. B.2
- Peterson, Fred, 1933-2
- Reed, John Calvin, 1930-2
- Haynes, Donald D.1
- Hinrichs, E. Neal1
- Luedke, Robert George, 1927-1
- O'Sullivan, Robert Brett, 1923-1
- Pillmore, C. L., 1930-1
