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Pilsbry, H. A. (1935). Mollusks of the fresh-water Pliocene beds of the Kettleman Hills and neighboring oil fields, California. Proceedings of the Academy of Natural Sciences of Philadelphia. 86: 541-570. Philadelphia.
Pilsbry, H. A. (1935). Mollusks of the fresh-water Pliocene beds of the Kettleman Hills and neighboring oil fields, California. Proceedings of the Academy of Natural Sciences of Philadelphia. 86: 541-570. Philadelphia.