Pilsbry, H. A. (1924). Some Alleghenian forms of the land-snail genus Gonyodiscus. Proceedings of the Academy of Natural Sciences of Philadelphia. 76: 417-421.
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Pilsbry, H. A.
1924
Some Alleghenian forms of the land-snail genus <i>Gonyodiscus</i>.
Proceedings of the Academy of Natural Sciences of Philadelphia