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Type: stamp Issuer: Cuba Date: 1962 Denom: ? Visibility: public Image owner: none postage 12/14/1962 3c multi issue=malaria eradication d=Chemist’s structural formulas for quinine cinchona plant unwmk perf=12.5 Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/b/1414/569/Chemist’s-structural-formulas-for-quinine-cinchona-plant.jpg Uploaded September 6, 2014, 5:00 pm by Stan Shebs