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      Memorial Day Sale

      Scientific American November 1913

      Two Unsolved Problems of Astronomy

      Planetary Pertubations and the Moon's Motion

      • By Arthur B. Turner on November 1, 1913

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      More in the November 1913 issue of Scientific American
      • Fleas can Transmit Infectious Diseases
      • The New Berlin Aquarium
      • Industrial Research in America
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