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Type: stamp Issuer: Austria Date: 1992 Denom: ? Visibility: public Image owner: none postage 3/27/1992 6s multi dt=Nature scientists d=Christian Doppler unwmk perf=14 Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/b/137/513/Christian-Doppler-1803-53-physicist---mathematician.jpg Uploaded September 2, 2014, 4:38 pm by Stan Shebs