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      Digital & 4-Year Archive

      Scientific American November 1974

      The Amateur Scientist, November 1974

      Of cross-staffs, paraboloids, sun viewers and other useful tools and experiments

      • By C. L. Stong on November 1, 1974

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      More in the November 1974 issue of Scientific American
      • 50 and 100 Years Ago, November 1974
      • Letters to the Editors, November 1974
      • The Development of the Immune System
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