Items

• [CJ605AAB], Cost Estimate, Edison Portland Cement Co, William Simpkin, April 24th, 1901
  1901-04-24
• [CJ642ABQ], Letter from William Simpkin to Thomas Alva Edison, May 31st, 1901
  1901-05-31
• [D0004AAA], Letter from William Simpkin to R L Taft, January 26th, 1900
  1900-01-26
• [D0711AAO], Letter from William Simpkin to Thomas Alva Edison, October 21st, 1907
  1907-10-21
• [LB064406], Letter from William Simpkin to Standard Tool Co, February 5th, 1900
  1900-02-05