Foraminifera source request
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Cushman, J. A. (1927). Foraminifera of the genus Siphonina and related genera. Proceedings of the United States National Museum. 72(2716): 1-15.
Cushman, J. A. (1927). Foraminifera of the genus Siphonina and related genera. Proceedings of the United States National Museum. 72(2716): 1-15.