Items

• [E1108AM], Letter from Niagara Alkali Co, Herman David Ruhm to Thomas Alva Edison, April 12th, 1911
  1911-04-12
• [E1108AP], Letter from Niagara Alkali Co, Herman David Ruhm to Thomas Alva Edison, April 21st, 1911
  1911-04-21
• [E1108AT], Letter from Niagara Alkali Co, Herman David Ruhm to Thomas Alva Edison, May 3rd, 1911
  1911-05-03
• [E1108AV], Letter from Niagara Alkali Co, Herman David Ruhm to Thomas Alva Edison, May 13th, 1911
  1911-05-13
• [E1141BM], Letter from Niagara Alkali Co, Herman David Ruhm to Thomas Alva Edison, November 14th, 1911
  1911-11-14
• [E1421CY], Letter from Niagara Alkali Co, Herman David Ruhm to Thomas Alva Edison, September 14th, 1914
  1914-09-14
• [E1421DD], Letter from Niagara Alkali Co, Herman David Ruhm to William Henry Meadowcroft, September 22nd, 1914
  1914-09-22