Raymond, P. E. (1911). A preliminary list of the fauna of the Allegheny and Conemaugh series in western Pennsylvania. Report Pennsylvannia Topographical and Geological Survey Committee. 7: 83-98.
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Raymond, P. E.
1911
A preliminary list of the fauna of the Allegheny and Conemaugh series in western Pennsylvania
Report Pennsylvannia Topographical and Geological Survey Committee