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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 Subcommittee on Select Revenue Measures, Committee on Ways and Means, U.S. House of Representatives
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Testimony before the Subcommittee on Housing and Consumer Interests, Select Committee on Aging, U.S. House of Representatives
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Testimony before the Subcommittee on Space Science and Applications, Committee on Science and Technology, U.S. House of Representatives
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