Items

• [E1518EAD], Letter from Thomas Alva Edison to Koppers (H.) Co, Charles Joseph Ramsburg, May 3rd, 1915
  1915-05-03
• [E1915AO1], Letter from Thomas Alva Edison to Koppers (H.) Co, July 29th, 1919
  1919-07-29
• [E1915AO3], Letter from William Henry Meadowcroft to Marc Darrin, Koppers (H.) Co, September 5th, 1919
  1919-09-05
• [E1915AQ], Letter from William Henry Meadowcroft to Marc Darrin, Koppers (H.) Co, September 18th, 1919
  1919-09-18
• [E1915AS], Letter from William Henry Meadowcroft to Marc Darrin, Koppers (H.) Co, September 25th, 1919
  1919-09-25
• [LB103523], Letter from Thomas Alva Edison to Charles Joseph Ramsburg, Koppers (H.) Co, April 22nd, 1915
  1915-04-22
• [LB105247], Letter from Thomas Alva Edison to Koppers (H.) Co, July 1st, 1915
  1915-07-01