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Creator
- Indiana. Department of Geology and Natural Resources18
- Ashley, Geo. H. (George Hall), 1866-195117
- Cubberley, Ellwood P., 1868-194117
- Shannon, C. W. (Charles William), 1879-193412
- Blatchley, Raymond S. (Raymond Sillliman)8
- Kindle, E. M. (Edward Martin), 1869-19408
- Foerste, Aug. F. (Aug. Frederic), 1862-19367
- Shannon, M. E.7
- Blatchley, W. S. (Willis Stanley), 1859-19406
- Cumings, E. R. (Edgar Roscoe), 1874-19676
- Siebenthal, C. E. (Claude Ellsworth), 1869-19306
- Price, J. A.5
- Hole, Allen David, 1866-19404
- Newsom, John F. (John Flesher), 1869-19284
- Tharp, W. E. (William Edgar)4
- Hopkins, Thomas Cramer, 1861-19353
- United States. Bureau of Soils3
- Coryell, Horace Noble, 1888-19652
- Ellis, R. W. (Robert W.)2
- Gorby, S. S. (Sylvester Scott)2