United States. Congress. House. Committee on Science and Astronautics.
The Practical Values of Space Exploration Report of the Committee on Science and Astronautics, U.S. House of Representatives, Eighty-Sixth Congress, Second Session
United States. Congress. House. Committee on Science and Astronautics. · 2006
ספרייה ציבורית, Project Gutenberg. בלי הרשמה.
Astronautics -- United StatesAstronautics and civilization