Proposals to increase the amount of controlled air space : hearings before the Subcommittee on Aviation of the Committee on Public Works and Transportation, House of Representatives, Ninety-sixth Congress, first session, March 20 and 21, 1979.
United States.Congress.House.Committee on Public Works and Transportation.Subcommittee on Aviation.
Washington : U.S. Govt. Print. Off.,
1979.
Air traffic control
Aeronautics