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van der Schalie, H. (1948). The land and fresh-water mollusks of Puerto Rico. Museum of Zoology, University of Michigan, Miscellaneous Publications. no. 70: 1-134. (Ann Arbor).
van der Schalie, H. (1948). The land and fresh-water mollusks of Puerto Rico. Museum of Zoology, University of Michigan, Miscellaneous Publications. no. 70: 1-134. (Ann Arbor).