Cushman, J. A. & Cederstrom, D. J. 1949. An Upper Eocene Foraminiferal Fauna from Deep Wells in York County, Virginia. Virginia Geological Survey Bulletin. 67: 1-58.
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Cushman, J. A. & Cederstrom, D. J. 1949. An Upper Eocene Foraminiferal Fauna from Deep Wells in York County, Virginia. Virginia Geological Survey Bulletin. 67: 1-58