Nine-digit zip code system
Subtitle: hearing before the Subcommittee on Postal Operations and Services of the Committee on Post Office and Civil Service, House of Representatives, Ninety-seventh Congress, first session, May 12, 1981
Publisher: U.S. G.P.O.
Published: 1981
Place of publication: Washington
Language: eng
Number of pages: 106
Subjects: Postal service -- United States; Zip codes
Notes: "Serial no. 97-5."