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      Digital & 4-Year Archive

      Scientific American August 1975

      The Amateur Scientist, August 1975

      Graphs that predict when planets will line up with another planet or the sun

      • By C. L. Stong on August 1, 1975

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      More in the August 1975 issue of Scientific American
      • Bibliography, August 1975
      • The Perception of Surface Color
      • 50 and 100 Years Ago, August 1975
      View Full Contents
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