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Author
- Geological Survey (U.S.)345
- Shaw, E. W. (Eugene Wesley), 1881-19355
- Amos, Dewey Harold, 1925-2
- Campbell, Marius Robinson, 1858-19401
- Finch, Warren Irvin, 1924-1
- Fuller, Myron L.1
- Hinds, Henry, 1883-19641
- Illinois State Geological Survey1
- Lee, Wallace, 1883-19721
- Smith, Avery E.1
- Udden, Johan August, 1859-19321
- United States. Bureau of Public Roads1
- Whitlow, Jesse W.1
