Customs Service mail opening : hearings ... Ninety-fifth Congress, first session, July 28; September 12, 15, and 19, 1977.
United States.Congress.House.Committee on Government Operations.Subcommittee on Government Information and Individual Rights.
Washington : U.S. Govt. Print. Off.,
1977.
Includes bibliographical references.
United States Postal Service.
United States Customs Service.