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Nagao, T. (1938). Some molluscan fossils from the Cretaceous deposits of Hokkaido and Japanese Saghalien Part 1. Lamellibranchiata and Scaphopoda. Journal of the Faculty of Science, Hokkaido Imperial University. Ser. 4, Geology and Mineralogy. 4(1-2), 117-142.
Nagao, T. (1938). Some molluscan fossils from the Cretaceous deposits of Hokkaido and Japanese Saghalien Part 1. Lamellibranchiata and Scaphopoda. Journal of the Faculty of Science, Hokkaido Imperial University. Ser. 4, Geology and Mineralogy. 4(1-2), 117-142.