Correspondence, writings, estate papers, printed matter, scrapbooks, photographs, and other papers pertaining to the works and travels of Barrus and Burroughs and to the administration of their estates. Subjects include conservation, family matters, John Burroughs Memorial Association, lectures, philosophy, poetry, politics, publishing, and travels including a trip to Hawaii. Correspondents include Frederick Samuel Dellenbaugh, Clyde Fisher, Clara Bryant Ford, Hamlin Garland, William Temple Hornaday, Adeline Barrus Johnson, Robert Underwood Johnson, William Sloan Kennedy, John Muir, Carl Sandburg, Ernest Thompson Seton, Ida M. Tarbell, George Augustus Warburton, Walt Whitman, and editors at Houghton Mifflin Company.