• Digitized Photographic Image
    Transparency, "Code Number at Large City" (1 of 2 transparencies)
    H. Bentley Hahn Personal PapersNovember 1962

    Transparency 1 of 2, "Code Number at Large City," (slide 8 of 20) for use in a presentation by H. Bentley Hahn titled, "Technical Explanation of Post Office Department's Proposed 'Zip Code' Program for the Postal System."

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