Loeblich, A. R.; Tappan, H. (1957). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. Bulletin United States National Museum. 215: 173-198.
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Loeblich, A. R.; Tappan, H.
1957
Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains