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      Scientific American May 19, 1917

      An Electric Camera for Deep Sea Photography, What is the Difference Between Coal Tar and Asphalt?

      • May 19, 1917

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      More in the May 19, 1917 issue of Scientific American
      • Motor Traction in Modern War
      • A Huge Mass of Jade
      • Coal Tar Dyestuffs in Great Britain
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