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Sheng, J. C. (1949). On the Occurrence of Zellia from the Maping Limestone of Chengkung, Central Yunnan. Bulletin of the Geological Society of China. 29(1-4): 105-109.
Sheng, J. C. (1949). On the Occurrence of Zellia from the Maping Limestone of Chengkung, Central Yunnan. Bulletin of the Geological Society of China. 29(1-4): 105-109.