Letter to Wilburt Cornell Davison, April 1, 1919
Letter to Marcia C. Noyes, January 3, 1914
Letter to George Sarton, ( 10, ? 1917?)
Letter to Simon Flexner, July 5, 1915
Letter to Lapp, October 3, 1919
Letter to Gwendolyn Francis Andras, July 10, 1917
Letter to Herbert Albert Laurens Fisher, April 2, 1919
Letter to John Young Walker MacAlister, July 2, 1919
Letter to Leonard L. Mackall, July 11, 1912
Letter to Thomas Stephen Cullen, July 5, 1915