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van der Vlerk, I. M. (1931). Caenozoic Amphineura, Gastropoda, Lamellibranchiata, Scaphopoda. Leidse Geologische Mededelingen. 5(1): 206-296.
van der Vlerk, I. M. (1931). Caenozoic Amphineura, Gastropoda, Lamellibranchiata, Scaphopoda. Leidse Geologische Mededelingen. 5(1): 206-296.