Stamp of USSR 2065 - postal stamp - PICRYL - Public Domain Media Search Engine Public Domain Search
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File:Stamp-ussr1991 chernobyl.png - Wikimedia Commons
1960 CPA 2501 - postal stamp, Soviet Union - PICRYL - Public Domain Media Search Engine Public Domain Search
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Soviet-Union 2564,2566,2567,2568,2569, 2571,2573,2574,2578-79 (complete issue)
ITA-LIY 1936 MiNr0078 pm B002 - public domain postal stamp scan - PICRYL - Public Domain Media Search Engine Public Domain Search
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Soviet Union Ussr Russia 1923-1991 PDF (Digital) Stamp Album Pages
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File:Stamp of USSR 2272.jpg - Wikimedia Commons