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Author
- Geological Survey (U.S.)241
- Curtin, Stephen E.4
- Iowa. Department of Natural Resources. Geological Survey Bureau3
- Geological Survey (U.S.), cartographer2
- Tillery, Anne C. (Anne Celeste)2
- Barr, G. L.1
- Bartos, Timothy T.1
- Casey, George D.1
- Clark, Allen K., cartographer1
- Conover, Clyde Stuart, 1916-1
- Dion, N. P.1
- Geological Survey (U.S.), cartographer, issuing body1
- Geological Survey (U.S.). Water Resources Division1
- Hyde, Luther W.1
- Kasmarek, Mark C.1
- Keefer, Donald A. (Donald Allen), 1963-1
- Lambert, Rebecca B.1
- Lewis, Barney D.1
- Margat, Jean F.1
- Miller, James A. (James Anderson), 1939-1
