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      Knowledge is Power

      Scientific American March 15, 1902

      The Search Light in Photographic Work

      • By Frank C. Perkins on March 15, 1902

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      More in the March 15, 1902 issue of Scientific American
      • A Pledge to Improve the Park Avenue Tunnel
      • Notes and Queries - March 15, 1902
      • The New Cunard Liners
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