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Solving postal problem could win million-dollar prize
New Scientist (subscription), UK – But even mathematicians have been surprised by the depth of the mystery that lurks behind an innocent question about postage stamps. … |
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Home / stamps / Solving postal problem could win million-dollar prize – New Scientist (subscription)
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Japan to introduce forgery-proof revenue stamps – NHK WORLD
Japan to introduce forgery-proof revenue stampsNHK WORLDJapan's National Tax Agency will introduce anti-counterfeit revenue stamps …