Creator: Iannacchione, A. T.; Ulery, J. P.; Hyman, D. M. & Chase, F. E.
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.
Contributing Partner: UNT Libraries Government Documents Department