Items

• [E1579BM], Letter from Richard Lewis Humphrey, American Concrete Institute to Stephen Babcock Mambert, February 6th, 1915
  1915-02-06
• [E1579BM1], Letter from Richard Lewis Humphrey, American Concrete Institute to Walter Seeley Mallory, February 6th, 1915
  1915-02-06
• [X511A], Report from Cass Gilbert, American Concrete Institute, Richard Lewis Humphrey, Egbert Jessup Moore, William H Ham, August 1915
  1915-08-00
• [X511E], Report from Emile George Perrot, Edward Dayton Boyer, Arthur Newell Talbot, Nathan Clarke Johnson, Richard Lewis Humphrey, Theodore Lincoln Condron, August 1915
  1915-08-00