Earth resources information system : hearings before the Subcommittee on Space Science and Applications of the Committee on Science and Technology, U.S. House of Representatives, Ninety-fifth Congress, first session, June 21, 22, 23, 1977.
United States.Congress.House.Committee on Science and Technology.Subcommittee on Space Science and Applications.
Washington : U.S. Govt. Print. Off.,
1977.
"No. 18."
Earth resources technology satellites.