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stamp-ArcticExplore-1959-wikipedia | This 1959 US postage st… | Flickr
Postage stamp - Wikipedia
File:Stamp Eastern Rumelia 1881 20pa.jpg - Wikipedia
Sheet of Stamps: Postage Stamp, Printing, Post Offices, Postage Stamp Separation, Paper Size, Penny Black : Surhone, Lambert M., Timpledon, Miriam T., Marseken, Susan F.: Amazon.it: Libri
Russian Philatelic Forgeries: Philatelic Fakes and Forgeries, François Fournier, Zemstvo Stamp, Illegal Stamps, List of Stamp Forgers, Philatelic Expertisation : Surhone, Lambert M., Timpledon, Miriam T., Marseken, Susan F.: Amazon.it: Libri
File:Stamps of Germany (DDR) 1959, MiNr 0583 B.jpg - Wikipedia
File:Stamps of Germany (BRD) 1968, MiNr 561.jpg - Wikipedia