Context

Context of Zip Code System in the U.S. Postal Service : hearings before the United States House Committee on Post Office and Civil Service, Subcommittee on Postal Facilities and Modernization, Eighty-Ninth Congress, first session, on Mar. 24, Apr. 8, 27, 28, May 11, 18, 19, 21, June 2, 8, 9, 1965, <Part 1>
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