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- aeronautics (12)
- united states (12)
- astronautics (6)
- manned space flight (4)
- outer space (4)
- space race (4)
- wright, orville, (4)
- wright, wilbur, (4)
- 航空 (4)
- astronautics and state (3)
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- haskell, katharine wright, (2)
- inventors (2)
- moon (2)
- space flight (2)
- space flight to the moon (2)
- space shuttles (2)
- world war, 1939-1945 (2)
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