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  2. Non-denominated postage - Wikipedia

    en.wikipedia.org/wiki/Non-denominated_postage

    The first United States non-denominated postage stamp, issued in 1975, was valued at 10 cents. Non-denominated postage is a postage stamp intended to meet a certain postage rate, but printed without the denomination, the price for that rate.

  3. Postmark - Wikipedia

    en.wikipedia.org/wiki/Postmark

    A postmark [1] is a postal marking made on an envelope, parcel, postcard or the like, indicating the place, date and time that the item was delivered into the care of a postal service, or sometimes indicating where and when received or in transit.

  4. Flats (USPS) - Wikipedia

    en.wikipedia.org/wiki/Flats_(USPS)

    To fit the definition a flat must: Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long (the side parallel to the address as read) OR ¼ inch thick.

  5. Commemoration of the American Civil War on postage stamps

    en.wikipedia.org/wiki/Commemoration_of_the...

    Civil War on stamps and envelopes. Benjamin, Maynard H., The History of Envelopes 2002, Envelope Manufacturers Association and EMA Foundation for Paper-Based Communications. For political impacts of postal system, unifying but also dividing the nation. chapters on "prelude to war", "wanted:riders" and "the war begins".

  6. POSTNET - Wikipedia

    en.wikipedia.org/wiki/POSTNET

    The Intelligent Mail barcode was originally supposed to be required beginning May 2011 however the USPS postponed the requirement date, allowing mailers to continue receiving automation discount rates using the POSTNET barcode until January 28, 2013, at which time Intelligent Mail barcode was required for those reduced rates.

  7. United States Postal Service irradiated mail - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal...

    The USPS warned that a number of products could be adversely affected, such as seeds, photographic film, biological samples, food, medicines, and electronic equipment. In the process of irradiation, mail is exposed to extreme heat. Paper is weakened and may appear to have been aged, with discoloration (e.g., yellowing), and brittleness.

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