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new zealand coal crushing test

199741ensp enspTan J K St George J D 1989 Geomechanics of underground coal mining under very weak overburden rocks at Hunfly East Mine New Zealand Mining Science and Technology 9 No3253265 Townsend J M Jennings W C Haycocks C Neall G M Johnson L R 1977 A relationship between the ultimate compressive strength of cubes and cylinders for

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