Learning from the Upper Big Branch tragedy : hearing before the Committee on Education and the Workforce, U.S. House of Representatives, One Hundred Twelfth Congress, second session, hearing held in Washington, DC, March 27, 2012.
Imprint
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2012.
