Items

Items

• 

  [D8613A], Recommendation Letter from Hermann von Helmholtz to Franz Schulze-Berge, January 15th, 1886

  1886-01-15
• 

  [D9055AAA], Letter from Hermann von Helmholtz to Thomas Alva Edison, January 2nd, 1890

  1890-01-02
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  [D9148AAH1], Letter from Hermann von Helmholtz to Thomas Alva Edison, March 19th, 1891

  1891-03-19
• 

  [SB134010E] Clipping, Undated