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Number portability hearing before the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Tenth Congress, first session, July 12, 2007
- "Number portability hearing before the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Tenth Congress, first session, July 12, 2007"@en
- "Number portability : hearing before the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Tenth Congress, first session, July 12, 2007"@en