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      Digital & 4-Year Archive

      Scientific American November 1939

      Anthracite Ash Improves Soil, Telescope Museum and more

      • By F. D. McHugh, Alexander Klemin on November 1, 1939

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      More in the November 1939 issue of Scientific American
      • Eclipsing Binaries
      • Our Point of View, November 1939
      • What's New in Photographic Equipment
      View Full Contents
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