Items

• [PT032AHL1], Letter from Herman E Kiefer to Henry Lanahan, October 30th, 1911
  1911-10-30
• [QQ001AAM], Letter from Frank Lewis Dyer to Charles Arthur Matcham, Lehigh Portland Cement Co, April 29th, 1904
  1904-04-29
• [QQ001AAN], Letter from Frank Lewis Dyer to Thomas Alva Edison, May 10th, 1904
  1904-05-10
• [QQ001AAP], Letter from Frank Lewis Dyer to Henri Hatch, May 23rd, 1904
  1904-05-23
• [QQ001AAQ], Letter from Henri Hatch to Frank Lewis Dyer, May 1904
  1904-05-00
• [QQ001ABE], Letter from Frank Lewis Dyer to Walter Seeley Mallory, December 3rd, 1906
  1906-12-03
• [QQ001ABF], Letter from Frank Lewis Dyer to Walter Seeley Mallory, February 6th, 1907
  1907-02-06