Postal research and development : hearings before the Subcommittee on Postal Personnel and Modernization of the Committee on Post Office and Civil Service, House of Representatives, Ninety-fifth Congress, second session, April 13 and 18, 1978.
United States.Congress.House.Committee on Post Office and Civil Service.Subcommittee on Postal Personnel and Modernization.
Washington : U.S. Govt. Print. Off.,
1979.
"Serial no. 95-81."
Postal service