Pilsbry, H. A. (1908). Notes on Succinea ovalis Say and S. obliqua Say. Proceedings of the Academy of Natural Sciences of Philadelphia. 60(1): 45-51, plate 7.
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Pilsbry, H. A.
1908
Notes on <i>Succinea ovalis</i> Say and <i>S. obliqua</i> Say
Proceedings of the Academy of Natural Sciences of Philadelphia