Foraminifera source request
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Cushman, J. A. (1926). The foraminifera of the Velasco Shale of the Tampico Embayment. Bulletin of the American Association of Petroleum Geologists. 10: 581-612.
Cushman, J. A. (1926). The foraminifera of the Velasco Shale of the Tampico Embayment. Bulletin of the American Association of Petroleum Geologists. 10: 581-612.