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Haas, F. (1955). Mollusca: Gastropoda. In: The Percy Sladen Trust Expedition to Lake Titicaca in 1937. Transactions of the Linnean Society of London. 3(1): 275-308. London.
Haas, F. (1955). Mollusca: Gastropoda. In: The Percy Sladen Trust Expedition to Lake Titicaca in 1937. Transactions of the Linnean Society of London. 3(1): 275-308. London.
