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      Scientific American April 1929

      Why Do Insects Migrate?

      More Controversy Than Knowledge Surrounds Their Mysterious Flights From North to South and Return

      • By S. F. Aaron on April 1, 1929

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      More in the April 1929 issue of Scientific American
      • A Factory in the Wilderness
      • Boston's New "Madison Square Garden"
      • Exploring the Biblical Beth-shan
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