Eocene and Oligocene larger Foraminifera from the Panama Canal Zone and vicinity.
- Washington, U.S. Govt. Print. Off., 1952.
- 41 p. illus., 28 plates, map. 29 cm.
- Geological Survey professional paper, 244 .
- Geological Survey (U.S.). Professional paper ; 244. .
"Prepared under the auspices of the Technical Cooperation Administration of the United States Department of State."