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Yen, T. C. (1935). The non-marine gastropods of North China. Part I. Publications du Musée Hoangho Paiho de Tien Tsin. 34: 1–57, pls 1–3.
Yen, T. C. (1935). The non-marine gastropods of North China. Part I. Publications du Musée Hoangho Paiho de Tien Tsin. 34: 1–57, pls 1–3.
