The three published catalogues of Arabic manuscripts in the Princeton University Library have been digitized and are now available online in PDF using Adobe Acrobat 5:
(1) Philip K. Hitti, Nabih Amin Faris, and Butrus `Abd al-Malik, Descriptive Catalog of the Garrett Collection of Arabic Manuscripts in the Princeton University Library, Princeton Oriental Texts, vol. 5 (Princeton: Princeton University Press, 1938);
(2) Rudolf Mach, Catalogue of Arabic Manuscripts (Yahuda Section) in the Garrett Collection, Princeton University Library, Princeton Studies on the Near East (Princeton: Princeton University Press, 1977);
(3) Rudolf Mach and Eric L. Ormsby, Handlist of Arabic Manuscripts (New Series) in the Princeton University Library, Princeton Studies on the Near East (Princeton: Princeton University Press, 1987).
Links to the digital files (PDF) are available in the Department of Rare Books and Special Collections HomePage:
and finding aids
<http://libweb2.princeton.edu/rbsc2/aids/msslist/maindex.htm> (scroll down to “Islamic Manuscripts”).
(Approximately 5,000 additional Islamic manuscripts (including most of the Persian and Ottoman Turkish manuscripts) are described in William M. Blair, Mohammad H. Faghfoory, and Karl R. Schaefer, “Preliminary Checklist of Uncataloged Islamic Manuscripts in the Department of Rare Books and Special Collections, Princeton University Library” (1995), which is available in the Department.)