Olsson, A. A. (1934). Contributions to the paleontology of northern Peru: The Cretaceous of the Amotape region. Bulletins of American Paleontology. 20(69): 1-104, pls. 1-11.
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Olsson, A. A.
1934
Contributions to the paleontology of northern Peru: The Cretaceous of the Amotape region