prepared at the request of the Subcommittee on Energy and Power of the Committee on Interstate and Foreign Commerce, United States House of Representatives by the Congressional Research Service, Library of Congress
prepared for the Subcommittee on Energy, Nuclear Proliferation, and Federal Services of the Committee on Governmental Affairs, United States Senate, by the Congressional Research Service, Library of Congress
prepared for the Subcommittee on International Security and Scientific Affairs of the Committee on Foreign Affairs, U.S. House of Representatives by the Congressional Research Service, Library of Congress