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  1. Tracking and Data Relay Satellites - NASA

  2. Tracking and Data Relay Satellite System - Wikipedia

  3. List of TDRS satellites - Wikipedia

  4. About TDRS - NSSDCA

  5. TDRS Activities - NASA

  6. TDRS 1, 2, 3, 4, 5, 6 (TDRS A, B, C, D, E, F)

  7. Three Generations of Tracking and Data Relay Satellite (TDRS ...