Letter to Unidentified Doctor, October 12, 1904
Letter to Unidentified, 1904
Letter to Unidentified, ca. June 20, 1888
Letter to Unidentified, October 29, 1901
Letter to Watt, March 4, 1915
Letter to Yale University Press, February 26, 1913
Letter to Yale University Press, January 28, 1913
Letter to Yale University Press, March 17, 1913
Letter to Yale University Press, March 27, 1913
Letter to Yale University Press, November 20, 1913