Bolli, H. M. (1957). Planktonic Foraminifera from the Eocene Naver and San Fernando formations of Trinidad, B.W.I. Bulletin United States National Museum. 215: 155-172.
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Bolli, H. M.
1957
Planktonic Foraminifera from the Eocene Naver and San Fernando formations of Trinidad, B.W.I