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Type: stamp Issuer: Russia Date: 1929 Denom: ? Visibility: public Image owner: none postage 10/1929 28k blkvio issue=industrialization d=blast furnace (1929) 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/192/530/Blast-furnace-and-Growth-diagram-of-iron-smelting-by-1933.jpg Uploaded August 25, 2014, 4:08 pm by Stan Shebs