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Author
- Geological Survey (U.S.)14
- Klemic, Harry, 1920-4
- Froelich, A. J. (Albert Joseph), 1929-3
- Weir, Gordon W. (Gordon Whitney), 1922-20113
- Blade, Lawrence V. (Lawrence Vernon), 1917-2
- Black, Douglas F. B.1
- Drake, Avery Ala, 1927-1
- Gannett, Henry, 1846-19141
- Helfrich, Charles T.1
- Kelly, W. J.1
- Maryland. Department of Geology, Mines, and Water Resources1
- McDowell, Robert C., 1935-1
- McFarlan, Arthur C. (Arthur Crane), 1897-1
- Naeff, M. A., compiler1
- Seiders, Victor M.1
- Willmon, J. R.1
