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Pilsbry, H. A. & Olsson, A. A. (1941). A Pliocene fauna from western Ecuador. Proceedings of the Academy of Natural Science of Philadelphia. 93: 1–79, 19 pls.
Pilsbry, H. A. & Olsson, A. A. (1941). A Pliocene fauna from western Ecuador. Proceedings of the Academy of Natural Science of Philadelphia. 93: 1–79, 19 pls.