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Proceedings of the Third Session in Berne 8-13 June 1964
International union of geological sciences (Committee on Mediterranean Neogene Stratigraphy)
Bok Flerspråklig 1966
The microfauna of the Aquitanian-Purdigalian of southwestern France
Drooger, Cornelis Willem
Bok Språk ikke angitt 1955
Foraminifera of the Orinoco-Trinidad-Paria shelf
Drooger, Cornelis Willem
Bok Språk ikke angitt 1953