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Publisher
- Works Progress Administration of Pennsylvania1,159
- Ohio. Division of Geological Survey7
- Indiana Geological Survey6
- Indiana Department of Geology and Natural Resources5
- William B. Burford5
- Department of Geography, Indiana University4
- Edward Stanford ... ; London3
- Wallace, McHarg, Roberts and Todd3
- United States Geological Survey2
- Braden and Burford1
- E. Cave1
- E. Mendenhall1
- F. Heritsch1
- For sale by United States Geological Survey1
- Geological Survey of Ohio1
- Geological and Natural History Survey of Minnesota ; St. Paul, Minnesota1
- Indiana Department of Conservation1
- Indiana Dept. of Conservation, Geological Survey1
- Office of Surveyor General of India ; Calcutta1
- Ohio. Department of Natural Resources1