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      Scientific American May 11, 1878

      Photographic Printing Processes in the Service of the Portuguese Government

      • By Ose Julio Rodriguez on May 11, 1878

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      More in the May 11, 1878 issue of Scientific American
      • Chess as a Test of Character
      • Indicator Cards Taken at the St. Louis Water Works
      • Stereoscopic Transparency Printing—Mr. Breese's Method
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