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Newell, N. D. (1938). Late Paleozoic pelecypods: Pectinacea. State Geological Survey of Kansas, Bulletin. 10(1): 1–123, 20 pl.
Newell, N. D. (1938). Late Paleozoic pelecypods: Pectinacea. State Geological Survey of Kansas, Bulletin. 10(1): 1–123, 20 pl.