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Pilsbry, H. A. (1926). Costa Rican land shells collected by A. A. Olsson. Proceedings of the Academy of Natural Sciences of Philadelphia. 78: 127-133.
Pilsbry, H. A. (1926). Costa Rican land shells collected by A. A. Olsson. Proceedings of the Academy of Natural Sciences of Philadelphia. 78: 127-133.
