The largest collection of Lessing's writing is at the Harry Ransom Humanities Research Center, at the University of Texas at Austin. There are 45 boxes of Lessing's materials at the Ransom Center that contain nearly all of her available manuscripts and typescripts up to 1999. Lessing kept none of the originals of her early manuscripts. Other institutions, including the McFarlin Library at the University of Tulsa, hold smaller collections.