Bolli, H. M. (1957). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, BWI. Bulletin of the U.S. National Museum. Vol. 215: 97-131.
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Bolli, H. M.
1957
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, BWI.