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  2. List of United States airmail stamps - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    Domestic air mail became obsolete in 1975, and international air mail [2] in 1995, when the USPS began transporting First Class mail by air on a routine basis. [3] [4] All post-1977 United States stamp images are copyright of USPS. [5] Scott cataloged stamps received a "C" designation for airmail issues beginning in 1940. Designated for ...

  3. United States Postal Service - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal_Service

    The full eagle logo, used in various versions from 1970 to 1993. The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas, and its associated states.

  4. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    Postal service in the United States began with the delivery of stampless letters whose cost was borne by the receiving person, later encompassed pre-paid letters carried by private mail carriers and provisional post offices, and culminated in a system of universal prepayment that required all letters to bear nationally issued adhesive postage stamps.

  5. Information-Based Indicia - Wikipedia

    en.wikipedia.org/wiki/Information-Based_Indicia

    Information-Based Indicia is a two-dimensional PDF417 or data matrix barcode combined with human-readable information. The barcode data contains such information as amount of postage, origin zip code, destination, mail class, weight, confirmation/tracking numbers, and a cryptographic signature. The human-readable information shows at a minimum ...

  6. U.S. space exploration history on U.S. stamps - Wikipedia

    en.wikipedia.org/wiki/U.S._space_exploration...

    On September 9, 1969, the U.S. Post office issued its first airmail stamp to depict a space exploration theme, the First Man on the Moon issue. The man depicted in the space suit is Neil Armstrong taking man's first step on the Moon. This issue was designed by Paul Calle.

  7. Citizens' Stamp Advisory Committee - Wikipedia

    en.wikipedia.org/wiki/Citizens'_Stamp_Advisory...

    Purpose. Each year, the Postal Service receives thousands of letters and petitions from the American public proposing stamp subjects. Established in 1957, the Citizens’ Stamp Advisory Committee (CSAC) reviews all of the proposals and selects stamp subjects that will be of enduring interest to large segments of the American population. The ...

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