Items

• [D9210AAS], Letter from Ponupo Mining and Transportation Co Ltd to Thomas Alva Edison, November 11th, 1892
  1892-11-11
• [D9332AAC], Letter from Samuel Adams, Ponupo Mining and Transportation Co Ltd to Thomas Alva Edison, April 18th, 1893
  1893-04-18
• [D9423AAF], Letter from Ponupo Mining and Transportation Co Ltd to Thomas Alva Edison, February 5th, 1894
  1894-02-05