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Author
- Geological Survey (U.S.)139
- Froelich, A. J. (Albert Joseph), 1929-2
- Fisher, George Wescott, 1937-1
- Hack, John T. (John Tilton), 1913-19911
- Martin, G. C. (George Curtis), 1875-19431
- Maryland Geological Survey1
- Miller, Benjamin L. (Benjamin LeRoy), 1874-19441
- Shattuck, George Burbank, 1869-19341
- United States. Bureau of Public Roads1
