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Tanaka, T. ;Nobuhara, T.; Ozawa, T. (1995). First Record of Fossil Cleobula betulina(Gastropoda :Conidae)from the Upper Pliocene Dainichi Sand of the Kakegawa Group, Shizuoka Prefecture,Central Japan and its Paleo-environmental Significance. VENUS (The Japanese Journals of Malacology). 54(1): 57 − 65.