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Start Over You searched for: Holding Institution University of Pennsylvania ✖ Remove constraint Holding Institution: University of Pennsylvania Scribe Muḥammad ibn al-Ḥusayn al-Ḥasan ✖ Remove constraint Scribe: Muḥammad ibn al-Ḥusayn al-Ḥasan Keywords Almagest (Ptolemy) ✖ Remove constraint Keywords: Almagest (Ptolemy)