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Author
- Geological Survey (U.S.)6
- Hansen, Robert E.4
- Cagle, Joseph W.1
- Grant, U. S. (Ulysses Sherman), 1867-19321
- Horick, Paul J.1
- Iowa Geological Survey1
- Owen, David Dale, 1807-1860, cartographer1
- Parker, Mary Combs1
- Sendlein, Lyle V. A.1
- Shaw, E. W. (Eugene Wesley), 1881-19351
- Todd, J. E. (James Edward), 1846-19221
