Items

• [D0831AAM], Letter from Henry Barnard Kummel, New Jersey. Geological Survey to Thomas Alva Edison, December 7th, 1908
  1908-12-07
• [D0831AAN], Letter from New Jersey. Geological Survey, Henry Barnard Kummel to Thomas Alva Edison, December 22nd, 1908
  1908-12-22
• [D0933AAB], Letter from Henry Barnard Kummel, New Jersey. Geological Survey to Thomas Alva Edison, January 4th, 1909
  1909-01-04
• [D0933AAO], Letter from New Jersey. Geological Survey, Henry Barnard Kummel to Thomas Alva Edison, September 21st, 1909
  1909-09-21
• [E1460AB], Letter from New Jersey. Geological Survey, Henry Barnard Kummel to Thomas Alva Edison, March 9th, 1914
  1914-03-09