01049nam 2200277z- 450 991069342530332120110416083959.0(CKB)5860000000035634(EXLCZ)99586000000003563420220406c2010uuuu -u- -engThe Upper Big Branch mine tragedy field hearing before the Committee on Education and Labor, U.S. House of Representatives, One Hundred Eleventh Congress, second session, hearing held in Beckley, WV, May 24, 20100-16-087128-X Upper Big Branch mine tragedy Coal mine accidentsWest VirginiaRaleigh CountyMine explosionsWest VirginiaRaleigh CountyFiredampUnited StatesSafety measuresMine safetyUnited StatesCoal mine accidentsMine explosionsFiredampSafety measures.Mine safetyBOOK9910693425303321The Upper Big Branch mine tragedy3208495UNINA