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Type: stamp Issuer: Russia Date: 1968 Denom: ? Visibility: public Image owner: none postage 5/30/1968 6k multi issue=8th Congress for Mineral Research dt=international congresses d=crystal 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/4542/031/8th-Congress-for-the-Development-of-Mineral-Resources.jpg Uploaded January 12, 2018, 7:44 pm by Stan Shebs