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Type: stamp Issuer: Russia Date: 1969 Denom: ? Visibility: public Image owner: none postage 6/20/1969 6k multi issue=Periodic Law 100th d=Dmitri Mendeleev & formulas unwmk perf=12 Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/b/4561/521/Centenary-of-Mendeleev-s-Periodic-Law-of-Elements.jpg Uploaded July 25, 2018, 4:10 pm by Stan Shebs