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Keywords
- Astrolabes1
- Astronomy, Arab1
- Calendars1
- History1
- Islamic Empire1
- Islamic countries1
- Manuscripts, Persian1
- New Jersey--Princeton1
- Nineteenth century1
- Sources1
- Thirteenth century1
- Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274. Sī faṣl[remove]1