Title
Investigating the nature of matter, energy, space, and time [electronic resource] : 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.
Other formats
Print version: United States. Congress. House. Committee on Science and Technology (2007). Subcommittee on Energy and Environment. Investigating the nature of matter, energy, space, and time