 Historical papyri are given identifying names — generally the name of the discoverer, first owner or institution where they are kept—and numbered, such as "Papyrus Harris I".Often an abbreviated form is used, such as "pHarris I".These documents provide important information on ancient writings; they give us the only extant copy of Menander, the Egyptian Book of the Dead, Egyptian treatises on medicine (the Ebers Papyrus) and on surgery (the Edwin Smith papyrus), Egyptian mathematical treatises (the Rhind papyrus), and Egyptian folk tales (the Westcar papyrus).