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Cushman, J. A.; Siegfus, S. S. (1939). Some new and interesting Foraminifera from the Kreyenhagen Shale of California. Contributions from the Cushman laboratory for foraminiferal research. 15(2): 23-33.
Cushman, J. A.; Siegfus, S. S. (1939). Some new and interesting Foraminifera from the Kreyenhagen Shale of California. Contributions from the Cushman laboratory for foraminiferal research. 15(2): 23-33.
