Olsson, A. A. (1929). Contributions to the Tertiary paleontology of northern Peru: part 2, Upper Eocene Mollusca and Brachiopoda. Bulletins of American Paleontology. Volume 15, No. 57, pp. 1(67)-51(117), 8 pls.
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Olsson, A. A.
1929
Contributions to the Tertiary paleontology of northern Peru: part 2, Upper Eocene Mollusca and Brachiopoda.