Items

• [D9820AAC], Letter from Thomas Alva Edison to Pennsylvania Steel Co, Harry Huse Campbell, January 20th, 1898
  1898-01-20
• [LB059639], Letter from Thomas Alva Edison to Harry Huse Campbell, January 10th, 1898
  1898-01-10
• [LB059663], Letter from Thomas Alva Edison to Harry Huse Campbell, Pennsylvania Steel Co, January 20th, 1898
  1898-01-20
• [LM214905], Letter from Thomas Alva Edison to Pennsylvania Steel Co, Harry Huse Campbell, January 18th, 1898
  1898-01-18
• [LM235009], Letter from Walter Seeley Mallory to Pennsylvania Steel Co, Harry Huse Campbell, December 22nd, 1897
  1897-12-22