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Publisher
- Geological Survey Division (Urbana, Ill.)9
- Geological Survey (U.S.)8
- Ohio. Division of Water4
- Allegan Improvement Association1
- American Geographical Society of New York1
- Benzie County Road Commission1
- Delta County Road Commission1
- Dept. of the Interior (Washington)1
- Forest Service?1
- Indiana Geological Survey1
- Indiana University1
- Metropolitan Planning Department, Marion County, Indiana1
- Montcalm County Road Commission1
- Ohio. Division of Geological Survey1
- U.S. Geological Survey (U.S.)1
- United States Geological Survey1