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- Ohio. Division of Water121
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- Ohio. Division of Geological Survey50
- Indiana Department of Geology and Natural Resources44
- William B. Burford41
- Wallace, McHarg, Roberts and Todd38
- The Bureau32
- The Committee20
- Army Map Service17
- Ohio. Department of Natural Resources13
- Bureau of Soils5
- Indiana Geological Survey5
- The Board5
- United States Bureau of Agricultural Economics5
- Tipografia della reverenda Camera apostolica ; Rome4
- U.S. Bureau of Agricultural Economics4
- For sale by United States Geological Survey3
- State Highway Commission of Indiana3
- Bureau of Chemistry and Soils2
- Joint Highway Research Project, Purdue University2