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Author
- Black, Douglas F. B.2
- Cressman, Earle Rupert, 1923-2
- Geological Survey (U.S.)2
- MacQuown, William Charles, 1915-2
- Campbell, Marius R. (Marius Robinson), 1858-19401
- Geological Survey of Pennsylvania1
- Greene, Robert C.1
- Kanizay, Stephen P.1
- Martin, G. C. (George Curtis), 1875-19431
- Miller, Robert D. (Robert David), 1922-1
- Outerbridge, William F.1
- Schweinfurth, Stanley P.1
