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December 27, 1919

Scientific American

December 27, 1919

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December 20, 1919

Scientific American

December 20, 1919

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December 13, 1919

Scientific American

December 13, 1919

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December 06, 1919

Scientific American

December 06, 1919

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November 29, 1919

Scientific American

November 29, 1919

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November 22, 1919

Scientific American

November 22, 1919

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November 15, 1919

Scientific American

November 15, 1919

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November 08, 1919

Scientific American

November 08, 1919

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October 25, 1919

Scientific American

October 25, 1919

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October 11, 1919

Scientific American

October 11, 1919

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September 27, 1919

Scientific American

September 27, 1919

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September 20, 1919

Scientific American

September 20, 1919

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