Petters, S. W. (1954). Tertiary and upper Cretaceous foraminifera from Colombia, South America. Contributions from the Cushman Foundation for Foraminiferal Research. 5(1): 37-41.
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Petters, S. W.
1954
Tertiary and upper Cretaceous foraminifera from Colombia, South America.
Contributions from the Cushman Foundation for Foraminiferal Research