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Pilsbry, H. A. (1948). Land Mollusca of North America (north of Mexico). Volume II Part 2. The Academy of Natural Sciences of Philadelphia Monographs. 3: i-xlvii, 521-1113. Philadelphia [19 March].
Pilsbry, H. A. (1948). Land Mollusca of North America (north of Mexico). Volume II Part 2. The Academy of Natural Sciences of Philadelphia Monographs. 3: i-xlvii, 521-1113. Philadelphia [19 March].
