Letter to Charles Nicoll Bancker Camac, December 15, 1906
Letter to Daniel Coit Gilman, July 2, 1898
Letter to Edward F. Milburn, December 16, 1906
Letter to Edward F. Milburn, June 7, 1909
Letter to Francis John Shepherd
Letter to Frederick T. Gates, May 2, 1907
Letter to Henri Amédée Lafleur, July 3, 1898
Letter to Henry Barton Jacobs, August 19, 1910
Letter to John George Adami, December 15, 1906
Letter to John George Adami, July 1898