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Tracking and Data Relay Satellite System - Wikipedia
List of TDRS satellites - Wikipedia
Tracking and Data Relay Satellites - NASA
Tracking and data relay satellite - Wikipedia
TDRS: An Era of Continuous Space Communications - NASA
Tracking and Data Relay Satellite (TDRS) Fleet Characteristics
About TDRS - NSSDCA
TDRS-M – Tracking and Data Relay Satellites - NASA Blogs
Tracking and Data Relay Satellite System - Encyclopedia Britannica
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