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Creator
- Indiana. Department of Geology and Natural Resources21
- Shannon, C. W. (Charles William), 1879-193411
- Tharp, W. E. (William Edgar)11
- Hurst, Lewis A. (Lewis Alexander), 1874-7
- Jones, Grove B., 1877-7
- Shannon, M. E.7
- United States. Bureau of Soils7
- Hole, Allen David, 1866-19404
- Mangum, A. W.4
- Neill, N. P. (Nelson Prentice)4
- Bushnell, T. M. (Thomas Mark), 1889-19763
- Ellis, R. W. (Robert W.)2
- Geib, W. J. (Warren Jacob), 1880-2
- Grimes, E. J. (Earl Jerome)2
- Grimes, E. J. (Earl Jerome), 1893-2
- Hertenstein, Earl2
- Marean, Herbert W.2
- Middleton, Philip (Soil surveyor)2
- Ulrich, H. P. (Herbert Paul), 1904-2
- Watkins, W. I. (William Isaac), 1888-19732