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Creator
- Cubberley, Ellwood P., 1868-194117
- Ashley, Geo. H. (George Hall), 1866-195114
- Blatchley, Raymond S. (Raymond Sillliman)8
- Foerste, Aug. F. (Aug. Frederic), 1862-19367
- Cumings, E. R. (Edgar Roscoe), 1874-19676
- Kindle, E. M. (Edward Martin), 1869-19405
- Siebenthal, C. E. (Claude Ellsworth), 1869-19305
- Price, J. A.4
- Shannon, C. W. (Charles William), 1879-19344
- Hopkins, Thomas Cramer, 1861-19353
- Gorby, S. S. (Sylvester Scott)2
- Hesler, R. S.2
- Holman, H. B.2
- Indiana. Department of Geology and Natural Resources2
- Jones, Grove B., 1877-2
- Leach, J. C.2
- Peacock, R. H.2
- Rose, C. M. (Soil surveyor)2
- Scovell, J. T. (Josiah Thomas), 1841-2
- Shannon, M. E.2