Inland Mollusca of Northern Mexico. III. Polygyridae and Potadominae. Proceedings of the Academy of Natural Sciences of Philadelphia, 108 1956: 19-40. 27 [Zoological Record Volume 94]
Inland Mollusca of Northern Mexico III. Polygyridae and Potadominae. Proceedings of the Academy of Natural Sciences of Philadelphia, 108 1956: 19-40. 27 [Zoological Record Volume 93]