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List of Apollo missions - Wikipedia
Canceled Apollo missions - Wikipedia
The Forgotten Apollo 18, 19, and 20 Missions - Apollo11Space
Why Apollo Really Stopped at 17 - Apollo 18 Conspiracy - Popular Mechanics
What Became of NASA's Extra Moon Landers for Apollo 18, 19, …
Apollo 18 through 20 - The Cancelled Missions - NSSDCA
Apollo 19 - Encyclopedia Astronautica
Canceled: Apollo 15 and Apollo 19 (1970) - WIRED
Down to Earth: The Apollo Moon Missions That Never Were
Cancelled spaceflight mission: Apollo 19
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