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Richards, E. F. (1947). Mesozoic fossils of the Peruvian Andes. Part II. Echinoidea, Pelecypoda and Gastropoda. The Johns Hopkins University Studies in Geology. 15: 29-80, 141-144.
Richards, E. F. (1947). Mesozoic fossils of the Peruvian Andes. Part II. Echinoidea, Pelecypoda and Gastropoda. The Johns Hopkins University Studies in Geology. 15: 29-80, 141-144.
