Letter to John H. Musser, 1889-90
Letter to Henry Vining Ogden, June 26, 1889
Letter to Henry Vining Ogden, September 23, 1889
Letter to Walter Baumgarten, October 3, 1890
Letter to Joseph Leidy, November 29, 1890
Letter to Henry Vining Ogden, January 5, 1891
Letter to John H./Henry Mills Hurd Musser, September 27, 1891
Letter to Francis John Shepherd, August 2, 1891
Letter to John H. Musser, 1891
Letter to Henry Vining Ogden, October 12, 1891