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Ping C., Yen T.-C. (1932). On five new species of non-marine gastropods of North China. Bulletin of the Fan Memorial Institute of Biology. 3(2): 25–36.
Ping C., Yen T.-C. (1932). On five new species of non-marine gastropods of North China. Bulletin of the Fan Memorial Institute of Biology. 3(2): 25–36.
