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      Knowledge is Power

      Scientific American July 21, 1917

      The Meaning of Bird Music

      Songs of Whose Beauty the Birds Are Consciously Appreciative

      • By Henry Oldys on July 21, 1917

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      More in the July 21, 1917 issue of Scientific American
      • An Inexpensive Dialyser for Class use
      • Eliminating Blue Monday from the Navy
      • Science Not Responsible for War
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