Items

• [E1518HBE], Letter from William Henry Meadowcroft to National Exposition of Chemical Industries, Charles Ferdinand Roth, August 18th, 1915
  1915-08-18
• [E1637AJ], Letter from William Henry Meadowcroft to Charles Ferdinand Roth, National Exposition of Chemical Industries, October 7th, 1916
  1916-10-07
• [LB109064], Letter from Thomas Alva Edison to Charles Ferdinand Roth, December 20th, 1915
  1915-12-20