http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
hearing before the Subcommittee on Energy of the Committee on Science and Astronautics, U.S. House of Representatives, Ninety-third Congress, second session, May 23, 1974
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United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Energy.