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Project Gemini - Wikipedia
Project Gemini - NASA
Gemini | NASA, Astronauts, Astronautics | Britannica
What Was the Gemini Program? (Grades 5-8) - NASA
Gemini's First Docking Turns to Wild Ride in Orbit - NASA
All You Need To Know About NASA’s Project Gemini
Gemini program | National Air and Space Museum
How the Gemini Spacecraft Worked - HowStuffWorks
Gemini Program: Two-Man Prep for Moon Missions | Space
Gemini: The spacecraft that paved the way to the Moon - BBC