Foraminifera source request
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Cushman, J. A. (1933). Two new genera, Pernerina and Hagenowella, and their relationships to other genera of the Valvulinidae. American Journal of Science. s5-26(151): 19-26.
Cushman, J. A. (1933). Two new genera, Pernerina and Hagenowella, and their relationships to other genera of the Valvulinidae. American Journal of Science. s5-26(151): 19-26.