Letter to Hackett (Yale University Press), August 2, 1913
Letter to Hackett (Yale University Press), June 14, 1913
Letter to Hackett (Yale University Press), November 1, 1913
Letter to Hackett (Yale University), July 3, 1913
Letter to Hythe, May 29, 1914
Letter to Iveagh, December 7, 1914
Letter to London Times, December 7, 1909
Letter to Maurice Debove, June 5, 1914
Letter to Mott, January 30, 1915
Letter to Mr. President, March 8, 1902