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Geologic Factors in Predicting Coal Mine Roof-Rock Stability in the Upper Kittanning Coalbed, Somerset County, Pennsylvania

Description: Report issued by the Bureau of Mines over the geology of roof-rock stability in coal mines. The distribution, frequency, and magnitude of roof falls in U.S. coal mines are discussed. This report includes maps, illustrations, and photographs.
Date: 1981
Creator: Iannacchione, A. T.; Ulery, J. P.; Hyman, D. M. & Chase, F. E.