Items

Items

• 

  [E1929DZ], Letter from Harry Trask to Journal of Industrial and Engineering Chemistry, Thomas Alva Edison, September 2nd, 1919

  1919-09-02
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  [E1929FL], Letter from Harry Trask to Ludwig Fredrick Ott, October 27th, 1919

  1919-10-27
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  [E1929FQ], Letter from Harry Trask to William Henry Meadowcroft, October 30th, 1919

  1919-10-30