International space activities, 1979 : hearings before the Subcommittee on Space Science and Applications of the Committee on Science and Technology, U.S. House of Representatives, Ninety-sixth Congress, first session, September 5 and 6, 1979.
United States.Congress.House.Committee on Science and Technology.Subcommittee on Space Science and Applications.
Washington : U.S. Govt. Print. Off.,
1979.
"No. 50."
Space flight
Astronautics.