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  2. Postage stamps and postal history of Puerto Rico - Wikipedia

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

    An 1878 stamp of Puerto Rico with King Alfonso XII. The postal history of Puerto Rico began around 1518, at least for official mail, when Spain adopted general postal regulations; although the first documentation of Spanish postal regulations specific to the Caribbean was 1794. [1]

  3. Postage stamps and postal history of Poland - Wikipedia

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

    A total of 64,000 copies of each was overprinted. The stamps were distributed to 41 post offices and shops. All the stamps were sold within ten days of being issued on 5 December 1918. Due to the haste of production errors such as inverted overprints and double overprints are known. [25]

  4. Postage stamps and postal history of South Moluccas

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

    In 1955, approximately 150 coloured triangular or rectangular stamp forgeries by New York and Munich stamp dealer Henry Stolow (1901–1971) appeared on the market without a date of issue.

  5. 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.

  6. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

  7. Postage stamps and postal history of Newfoundland - Wikipedia

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

    A 1910 stamp of Newfoundland. This is a survey of the postage stamps and postal history of Newfoundland. Newfoundland is a large Canadian island off the east coast of North America, and the most populous part of the Canadian province of Newfoundland and Labrador. The first postage stamps of the Dominion of Newfoundland were issued in 1857. [1]

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