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black cotton
In India, soil from 6 to 10 ft (1.8 to 3.0 m) in thickness overlying the coal measures, which, in dry weather, shrinks and produces mud cracks.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
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(Milwaukee, United States)