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Pioneer 1 - Wikipedia
Able 2 (Pioneer 1) - NASA Science
Pioneer program - Wikipedia
October 1958 - Pioneer 1 Launched - NASA
60 Years Ago: NASA Launches its First Satellite - NASA
Pioneer I Launch - NASA
NASA - NSSDCA - Spacecraft - Details
NASA’s first launch: Pioneer 1 [October 11, 1958] - Our Planet
Able 1 (Pioneer 0) - NASA Science
The Pioneer Missions - NASA Technical Reports Server (NTRS)