Investigating the nature of matter, energy, space, and time : hearing before the Subcommittee on Energy and Environment, Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, first session, October 1, 2009.
Imprint
Washington : U.S. G.P.O. : For sale by the Supt of Docs., U.S. G.P.O., 2009.