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      Scientific American April 11, 1914

      A Mountain of Copper, Air Pressures in Playing Wind Instruments, and more

      • April 11, 1914

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      More in the April 11, 1914 issue of Scientific American
      • A Self-steering Farm Motor, Fodder Equivalents and more
      • Guns on Aeroplanes
      • New Books, etc.-April 11, 1914
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