00822oam 2200169z- 450 991070302820332120190726220922.0(CKB)3460000000118244(EXLCZ)99346000000011824420151109c2010uuuu -a- -engUpper 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, 2010Upper Big Branch mine tragedy BOOK9910703028203321Upper 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, 20103117074UNINA