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Creator
- Cubberley, Ellwood P., 1868-194116
- Ashley, Geo. H. (George Hall), 1866-19513
- Kindle, E. M. (Edward Martin), 1869-19403
- Shannon, C. W. (Charles William), 1879-19343
- Blatchley, W. S. (Willis Stanley), 1859-19402
- Hopkins, Thomas Cramer, 1861-19352
- Jones, Grove B., 1877-2
- Newsom, John F. (John Flesher), 1869-19282
- Peacock, R. H.2
- Rose, C. M. (Soil surveyor)2
- Shannon, M. E.2
- Blatchley, Raymond S. (Raymond Sillliman)1
- Brill, J. Bayard1
- Coryell, Horace Noble, 1888-19651
- Foerste, Aug. F. (Aug. Frederic), 1862-19361
- Hesler, R. S.1
- Hole, Allen David, 1866-19401
- Indiana. Department of Geology and Natural Resources1
- Quinn, E. J. (Edward J.)1
- Tharp, W. E. (William Edgar)1