1. Free Library of Philadelphia, Lewis E 250 DS ID: DS4589 Title: Treatise on astrolabes Author: John of Seville ? Place: undetermined Date: 1400-1499
2. Princeton University, Islamic Manuscripts Garrett no. 307Y DS ID: DS14500 Title: Treatise on astrolabes Author: Seydi Ali Reis Date: between 16--? and 17--?