Olsson, A. A. (1922). The Miocene of northern Costa Rica with notes on its general stratigraphic relations. Bulletins of American Paleontology. 9(39): 173-481 [1-309], pls 1-32 [4-35].
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Olsson, A. A.
1922
The Miocene of northern Costa Rica with notes on its general stratigraphic relations