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Testimony before the Committee on Energy and Natural Resources, United States Senate
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Testimony before the Subcommittee on Energy Research and Production, Committee on Science and Technology, U.S. House of Representatives
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Testimony before the Subcommittee on Transportation, Committee on the Environment and Public Works, United States Senate
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Committee Print
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Testimony before the Committee on the Budget, U.S. House of Representatives
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Testimony before the Subcommittee on Science, Technology, and Space, Committee on Commerce, Science, and Transportation, United States Senate
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Testimony before the Committee on the Budget, U.S. House of Representatives
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Testimony before the Task Force on Distributive Impact of Budget and Economy Policies, Committee on the Budget, U.S. House of Representatives