• Digitized Photographic Image
    Transparency, "Facing Slips" for Regions
    H. Bentley Hahn Personal PapersNovember 1962

    “Facing Slips” transparency showing examples of zip codes for regions (slide 19 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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