Olsson A.A. (1931). Contribution to the Tertiary paleontology of northern Peru: part 4, the Peruvian Oligocene. Bulletins of American Paleontology. 17(63): 97-264 [1-168], pls 13-33.
137204
Olsson A.A.
1931
Contribution to the Tertiary paleontology of northern Peru: part 4, the Peruvian Oligocene