%0 Government Document %0 Book %A Kertis, Carla A. %I U.S. Dept. of the Interior, Bureau of Mines %D 1985 %C Pittsburgh, Pa. %G English %B Report of investigations (United States. Bureau of Mines) ; %T Reducing hazards in underground coal mines through the recognition and delineation of coalbed discontinuities caused by ancient channel processes %U https://purl.fdlp.gov/GPO/LPS98493