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Descriptions of New Species of Fossils from the Clinton, Lower Helderberg, Chemung, and Waverly Groups, Found in the Collections of the Geological Survey of Pennsylvania

George B. Simpson
Transactions of the American Philosophical Society
Vol. 16, No. 3 (1890), pp. 435-460
DOI: 10.2307/1005399
Stable URL: http://www.jstor.org/stable/1005399
Page Count: 26
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