Letter to Russell H. Chittenden, November 14, 1904
Letter to Francis R. Packard, November 11, 1902
Letter to Sir John Burdon Sanderson, June 21, 1904
Letter to T. Herbert Warren, November 10, 1904
Letter to Francis R. Packard, December 5, 1901
Letter to John H. Musser, November 4, 1902
Letter to George Dock, November 10, 1904
Letter to W.H. Howell, June 2, 1904
Letter to Leonard L. Mackall, June 28, 1910
Letter to Whitelaw Reid, December 27, 1910