Guo, S.-Y. (1983). On two new nonmarine Gastropoda genera from the Early Pleistocene in Nihewan region of Yangyuan, Hebei. Transactions of the Chinese Society of Malacology. 1: 175-179.
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Guo, S.-Y.
1983
On two new nonmarine Gastropoda genera from the Early Pleistocene in Nihewan region of Yangyuan, Hebei