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1
Opportunities for ballistic missions to Halley's comet /
by Farquhar, Robert W. (Robert Willard), Wooden, William H.
Washington : Springfield, Va. : National Aeronautics and Space Administration ; For sale by the National Technical Information Service, 1977

Government Document Book
2
International Cometary Explorer /
Washington, D.C. : The Administration, 1985

Government Document Photo
3
Physics of the moon and the planets : (Fizika luny i planet)
Jerusalem : Israel Program for Scientific Translations : [Available from the U.S. Dept. of Commerce, Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.], 1966

Government Document Book
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