Items

• [D8020ZHK], Letter from Porter's (William) Sons, Joseph Barre to Thomas Alva Edison, October 5th, 1880
  1880-10-05
• [D8020ZHW], Letter from Porter's (William) Sons to Thomas Alva Edison, October 14th, 1880
  1880-10-14
• [D8020ZID], Letter from Porter's (William) Sons to Thomas Alva Edison, October 26th, 1880
  1880-10-26