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Facts about Coal Mining 1: the development The development of coal mining from time to time has been improved At first men dug the tunnel to gain the coal The coal would be put on the carts for the manual extraction process over these men have to transport the cars passing the long wall mines Facts about Coal Mining 2: the small
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Address:High-tech Zone , ZhengZhou , China
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High-tech Zone , ZhengZhou , China