"Elena and Ivan Dujčev" scientific library contains about 60 000 library items and is one of the richest documentary bases for investigation of Bulgarian, Byzantine and West European medieval history, art, paleography and literature. The works of classical and medieval authors, reference literature, Bulgarian and foreign specialized medieval publications, is extensively covered. The extremely rich stock of the library provides possibilities for work to many students and professors from all humanitarian specialities. Thanks to the very active international contacts of Prof. Ivan Dujčev, the library holds also a number of unique publications amongst the Bulgarian literary stock. As a result of the intensive scientific activity and the large printed production, Prof. Ivan Dujčev Centre has won an authority amid the scientific circles and a number of outstanding Bulgarian and foreign scholars have devised their personal libraries to the Centre, as for instance Christo Gandev, Vesselin Beљevliev, Todor Borov, Boris Gerov, Georgi Mihailov, Velizar Velkov partially T. Gerassimov and L. Bassmadjiev, while other personal libraries came in through purchasing: those of Peter Charanis, Assen Vassiliev, Dimitar Mihalčev.
The Centre stores the richest collection of Greek manuscripts in Bulgaria (about 500 codexes), over 70 Slavic and about 200 oriental, bilingual and trilingual manuscripts from 9th till 19th Centuries. Thus all manuscript and linguistic traditions on the Balkans have been presented in the manuscript collection: Greek, Slavonic and Oriental. The Centre keeps on filling up the stock through purchases, the funds being raised from target donations. The scientific processing, restoration and conservation of the manuscript and the archival collections are realized along several international projects with colleagues from different institutes in the country and abroad (like: Japan Foundation, Sumitomo Foundation, Vaseda University - Tokyo; conservation-restoration laboratory - University Graz /Austria/; prof. A. Tselikas /National Bank Cultural Foundation, Athens/ etc.).
The archival wealth of Prof. Ivan Dujčev Centre includes the scientific archives and the epistle heritage of prominent university professors: Ivan Dujčev, Nikola Mihov, Todor Borov, Assen Vasiliev, Velizar Velkov. The epistle corpus comprises over 20 000 letters of these scholars, as well as the diaries of expeditions to Mount Athos and the Balkans, the meeting papers of the Faculty of History which reveal the University's history.