Letter to D'Arcy Power, April 1, 1919
Letter to John George Adami, January 3, 1914
Letter to Richard Pearson Strong, January 1, 1919
Letter to George Sarton, (5,? 1917?)
Telegram, 20 November 1899
Letter to Herbert Stanley Birkett, July 16, 1914
Letter to Harry Friedenwald, January 4, 1915
Letter to Alexander Dougall Blackader, July 13, 1916
Letter to Thomas McCrae, January 2, 1907
Letter to Arthur T. Hadley, July 10, 1912