p. 23 - The text as written implies that there are no known versions of any of Ishaq's translations that have not been corrected by Thabit. Although no known manuscripts now exist, Ibn al-Salah says that he had a copy of if Ishaq's verstion of the Almagest, in Ishaq's own hand. See Kunitzsch, P., 1975, Zur Kritik der Koordinatenueberlieferun im Sternkatalog des Almagest, Goettengen, pp. 40-41.