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Representatives of NASA Langley and Boeing signed the Lunar Orbiter contract on 16 April 1964 and sent it to NASA headquarters for final review. Three weeks later, on 7 May, Administrator James E. Webb approved the $80-million incentives contract to build five Lunar Orbiter spacecraft. Published in James R. Hansen, Spaceflight Revolution: NASA Langley Research Center From Sputnik to Apollo, NASA SP-4308, p. 331.