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Space flight 22 History 20 Exploration 19 Manned space flight 18 Outer space -- 18 Astronauts -- 17 Space flight -- 17 more ... Juvenile literature 13 Manned space flight -- 12 Astronauts 11 Space flight to the moon 11 Exploration -- 10 Astronautics 9 Astronautics -- 8 Biography -- 8 History -- 8 Space flight to the moon -- 8 Pictorial works 5 Space flight to Mars 5 Project Apollo (U.S.) 4 Space sciences 4 Juvenile literature -- 3 Moon -- 3 Space Shuttles 3 Space stations 3 African America astronauts -- 2 Astronomy -- 2 Astronouts 2 Biography 2 Extravehicular activity (Manned space flight) 2 less ...