Items

• [E1438AP], Letter from Miner Louis Hartmann to Thomas Alva Edison, April 27th, 1914
  1914-04-27
• [E1438AU], Letter from Miner Louis Hartmann to William Henry Meadowcroft, May 6th, 1914
  1914-05-06
• [E1438AW], Letter from Miner Louis Hartmann to William Henry Meadowcroft, May 14th, 1914
  1914-05-14
• [E1836AE], Letter from Miner Louis Hartmann to Thomas Alva Edison, March 6th, 1918
  1918-03-06