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      Knowledge is Power

      Scientific American August 27, 1921

      Deep-Level Rapid Transit, Armaments Offset Reparations and more

      • August 27, 1921

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      More in the August 27, 1921 issue of Scientific American
      • Our Prehistoric Inhabitants, Old Peruvian Surgery
      • With the Engineers of Industry
      • A Problem and its Attempted Solution
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