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Schwengel, J. S. (1938). Zoological results of the George Vanderbilt South Pacific Expedition, 1937. Part I,-Galapagos Mollusca. Proceedings of the Academy of Natural Sciences of Philadelphia. 90: 1-3.
Schwengel, J. S. (1938). Zoological results of the George Vanderbilt South Pacific Expedition, 1937. Part I,-Galapagos Mollusca. Proceedings of the Academy of Natural Sciences of Philadelphia. 90: 1-3.
