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Different types of roof rock require different methods of support; study of characteristics of strata overlying coal seam may result in reducing mine timbering cost.
Different types of roof rock require different methods of support; study of characteristics of strata overlying coal seam may result in reducing mine timbering cost.
Causes and prevention of mine roof falls
Min Congress J
Smith, F.G. (author)
1946
4 pages
Article (Journal)
English
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