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      Digital & 4-Year Archive

      Scientific American September 20, 1919

      Effect of Light on Living Organism

      • By Fritz Schanz Dresden on September 20, 1919

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      More in the September 20, 1919 issue of Scientific American
      • Colliery Shaft Sinking
      • Correspondence - September 20, 1919
      • A Spherometer of Precision
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