Letter to William Willoughby Francis, August 23, 1918
Letter to William Willoughby Francis, April 12, 1916
Letter to William Williams Keen, July 18, 1908
Letter to William Williams Keen, February 21, 1919
Letter to William Williams Keen, April 15, 1915
Letter to William Sydney Thayer, September 4, 1914
Letter to William Sydney Thayer, September 27, 1905
Letter to William Sydney Thayer, September 25, 1914
Letter to William Sydney Thayer, September 12, 1919
Letter to William Sydney Thayer, September 11, 1914