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- United States178
- National Renewable Energy Laboratory (U.S.), issuing body56
- United States. Congress. Senate. Committee on Energy and Natural Resources53
- International Energy Agency49
- Films for the Humanities & Sciences (Firm)44
- Infobase44
- ebrary, Inc38
- Library of Congress. Congressional Research Service33
- Organisation for Economic Co-operation and Development32
- United States. Congress. House32
- SpringerLink (Online service)31
- United States. Office of Energy Markets and End Use27
- National Renewable Energy Laboratory (U.S.)23
- United States. Department of Energy23
- United States. General Accounting Office19
- United States. Congress. House. Committee on Interstate and Foreign Commerce. Subcommittee on Energy and Power17
- United States. Energy Information Administration17
- United States. Congress. Senate. Committee on Foreign Relations16
- Hittman Associates15
- ProQuest (Firm)15