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      Scientific American November 1939

      50 Years Ago in Scientific American, November 1939

      Articles from the Scientific American archive

      • November 1, 1939

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      More in the November 1939 issue of Scientific American
      • Anthracite Ash Improves Soil, Telescope Museum and more
      • Eclipsing Binaries
      • Our Point of View, November 1939
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