Haynes, J. (1956). Certain smaller British Paleocene Foraminifera. Part I. Nonionidae, Chilostomellidae, Epistominidae, Discorbidae, Amphistogenidae, Globigerinidae, Globorotolidae and Gumbelinidae. Contributions from the Cushman Foundation for Foraminiferal Research. 7: 79-101.
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Haynes, J.
1956
Certain smaller British Paleocene Foraminifera. Part I. Nonionidae, Chilostomellidae, Epistominidae, Discorbidae, Amphistogenidae, Globigerinidae, Globorotolidae and Gumbelinidae
Contributions from the Cushman Foundation for Foraminiferal Research