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NASA planned to send human missions to the Moon through Apollo 20. Congressional cutbacks in NASA allocations accelerated the end.
Space Race, SpaceNext50
Apollo at 50: Why haven't we gone back? — Moonshot Mobility
50 years ago, we flew to the moon. Here's why we can't do that
Astronauts Explain Why Humans Haven't Returned to the Moon in Decades
Apollo 17: Why haven't we been back to the Moon?, Science
Astronauts Explain Why Humans Haven't Returned to the Moon in Decades
Neil Armstrong, SpaceNext50
Why Did We Stop Going To The Moon? (And Why We're Going Back
Apollo 11, SpaceNext50
Half a century after Apollo, why haven't we been back to the Moon