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- Iowa. Department of Natural Resources. Geological Survey Bureau10
- Geological Survey (U.S.)3
- Anderson, Raymond R.2
- Mulford, John C., cartographer2
- Chapman, Silas, cartographer1
- Dorheim, Fred H.1
- Hershey, H. Garland (Howard Garland), 1905-1
- Horick, Paul J.1
- Iowa Geological Survey1
- Johnson, A. J. (Alvin Jewett), 1827-1884, cartographer1
- Mills & Co., cartographer1
- Parker, Mary Combs1
- Robbins, Safford & Co., cartographer1
