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593. Harvard University, MS Arab 143 Title: Mafātīḥ sharāʾiʻ al-Islām Author: Muḥammad ibn ʻĪsá ibn al-Ḥāj Manṣūr ibn al-Ḥāj Ḥasan Qāsim Faṣāʻī Date: 133 [750 or 751
594. Harvard University, MS Arab 101 Title: Kitāb rasāʾil ʻilm al-uṣūl Author: Nūr al-Dīn al-Ḥusayn ibn al-Ḥasan ibn ʻAlī al-Shāfī al-ʻĀmilī Date: 319 [931 or 932
595. Harvard University, MS Arab 321 Title: Qawāʻid wa-al-fawāʼid Author: Muhammad Jamaluddin al-Makki al-Amili Date: 739
596. Harvard University, MS Arab 351 Title: Shurūṭ al-ṣiyyām wa-uṣūl al-Islām Date: 567 [1171 or 1172
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598. Harvard University, MS Arab 290 Title: Kitāb fī al-lughah al-ʻArabīyah Author: Abu-'l-Ḥasan ʿAlī Ibn-ʿAbdallāh Ibn-Muḥammad an- Nubāhī Date: 955 [1548 or 1549
599. Harvard University, MS Arab 82 Title: Kitāb fī al-lughah Author: Abu Hatim Muhammad ibn Idris al-Razi Date: 800 [1397 or 1398
600. Harvard University, MS Arab 352 Title: Kitāb fī al-lughah al-ʻArabīyah Author: Sibawayh Date: 833 [1429 or 1430