Items

• [E1518DEQ], Letter from Charles Joseph Ramsburg, Koppers (H.) Co to William Henry Meadowcroft, April 20th, 1915
  1915-04-20
• [E1518DFN], Letter from Koppers (H.) Co, Charles Joseph Ramsburg to Thomas Alva Edison, April 23rd, 1915
  1915-04-23
• [E1915AO2], Letter from Marc Darrin, Koppers (H.) Co to Thomas Alva Edison, William Henry Meadowcroft, July 31st, 1919
  1919-07-31
• [E1915AO4], Letter from Marc Darrin, Koppers (H.) Co to William Henry Meadowcroft, September 10th, 1919
  1919-09-10
• [E1915AP], Letter from Marc Darrin, Koppers (H.) Co to William Henry Meadowcroft, September 16th, 1919
  1919-09-16
• [E1915AR], Letter from Koppers (H.) Co, Marc Darrin to William Henry Meadowcroft, September 22nd, 1919
  1919-09-22