The Lilly Library is the rare books, manuscripts, and special collections library of the Indiana University Libraries, Bloomington. Its collections represent a diversity of subjects, including literature; children’s literature; history; folklore; science; radio, film and television; book collecting and bookselling; journalism; and translation.
The Hughes, Ted mss. II, 1957-1962, consist of letters from poet Ted Hughes, 1930-1998, and poet Sylvia Plath, 1932-1963, to Hughes' brother and sister-in-law, Gerald and Joan Hughes.
The Kopp mss., 1955-1958, consists of correspondence and memorabilia relating to author Sylvia Plath's time at Cambridge, collected by her friend Jane Kopp.
The Plath mss. IX, ca. 1972-2012, consists of correspondence between Aurelia Plath (Sylvia Plath's mother) and Olive Clifford Eaton (a neighbor in Winthrop, MA), Mary Alice Ericson (Olive Eaton's daughter), and Margery DeLerno (Olive Eaton's daughter).
The Plath mss. VII, ca. 2012, consist of posters, schedules, handouts, programs and other ephemera related to the events surrounding the Sylvia Plath 70th Year Literary Symposium, 2002 and the Sylvia Plath Symposium 2012 - The October Poems: the Archives and the Creative Process Seminar, which were held on the IU Campus.
The Thomas, T. mss., ca. 1976–1990, consist of the papers of Trevor Thomas, the neighbor of Sylvia Plath and the last person to see her alive. The collection contains materials relating to Thomas' memoir of Plath as well as documents from Ted Hughes' libel suit against him.