The John M. Olin Library at the University of Washington in St. Louis, Missouri, has a couple different Plath collections. They have a Hughes Collections as well as the papers of Lee Anderson. Lee Anderson met Plath and Hughes around 1958, and recorded both poets reading their poems during their time in Northampton and Boston. The Lee Anderson Papers (finding aid here ) contains the following: Plath's autograph in an autograph book and this quote, "Yet, shrined on her shelf, the grisly visage endured", from her poem "The Lady and the Earthenware Head" dated 15 April, 1958, and two letters, dated 27 April, 1958 and 18 February, 1959. The Lee Anderson Papers also includes a number of typescripts of Plath's poems. These are: November graveyard [poem]. Ts, with corrections, 1p., [1958]. (27 April 1958). Spinster [poem]. Ts [carbon], 1p., [1958]. (27 April 1958). On the plethora of dryads [poem]. Ts, 2pp., [1958]. (27 April 1958). On the difficulty of conjuring u...