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      Scientific American October 1926

      Little-known Ice Ages of Great Antiquity

      Most People Know of One Glacial Period. But There Were Several Before That

      • By Albert G. Ingalls on October 1, 1926

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      More in the October 1926 issue of Scientific American
      • Clean Comfort in the Home
      • Guinea Pigs of Motordom!
      • The "America's" Cup Defenders
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