00862oam 2200169z- 450 991070303420332120190726220741.0(CKB)3460000000111218(EXLCZ)99346000000011121820151109c2010uuuu -a- -engH.R. 6172 : protecting student athletes from concussions : hearing before the Committee on Education and Labor, U.S. House of Representatives, One Hundred Eleventh Congress, second session, hearing held in Washington, DC, September 23, 2010H.R. 6172 BOOK9910703034203321H.R. 6172 : protecting student athletes from concussions : hearing before the Committee on Education and Labor, U.S. House of Representatives, One Hundred Eleventh Congress, second session, hearing held in Washington, DC, September 23, 20103203086UNINA