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      Scientific American January 1922

      Reading between the Lines

      Methods of Invisible Writing Employed during the War, and their Detection

      • By Jacques Boyer on January 1, 1922

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      More in the January 1922 issue of Scientific American
      • Bottling and Labeling Machine for Small Scale Operations, Applying Electricity to the Metal-Melting Pot, and more
      • Government Railroad in Alaska Nearing Completion
      • Lessening Lumber Losses
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