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Cushman, J. A. (1933). Post-Cretaceous occurrence of Gümbelina with a description of a new species. Contributions from the Cushman laboratory for Foraminiferal Research. 9(3): 64-69.
Cushman, J. A. (1933). Post-Cretaceous occurrence of Gümbelina with a description of a new species. Contributions from the Cushman laboratory for Foraminiferal Research. 9(3): 64-69.