The Edward G. Mathews collection (on loan) which consists of ca. 6,000 volumes in various fields of academic study:
Patristics and Early Christian History
Orthodox Christian Studies
Many titles published by Gorgias Press, SEERI, and Bar Hebraeus Verlag
Plus a large digital collection of books, manuscripts, audio and video files, etc. available from the eBethArké portal.
Beth Mardutho has recently signed an agreement with Rutgers University Libraries, which will provide benefits and resources for both institutions, including the housing of some of BM's rare materials in Rutgers' library. You can read more about this agreement here.
Retired scholars who whish to bequest their collections to the library are encouraged to contact George A. Kiraz for arrangement. Two scholars have already promised their collections to the library.