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      Scientific American September 20, 1913

      An Aviation Map of the World and Marks for Aviators

      Based on the International World Map

      • September 20, 1913

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      More in the September 20, 1913 issue of Scientific American
      • Lenard' s Researches on Phosphorescence
      • The Presence of Boron in Milk and in Eggs
      • Art in Natural History
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