The Abagar Bulgarian Catholic Literary Archive was founded in 1981 by Monsignor Georgi Eldarov in Rome. It was a collection of many thousands of Bulgarian books and materials related to Bulgarian history from the late eighteenth century until the 1990s, including rare historical publications, such as from the Robert College in Istanbul and the Bulgarian Uniate Church. The collection also included materials collected from Bulgarians living outside Bulgaria, but who were closely associated with its history and culture.

Although the Bulgarian communist regime was hostile to the Catholic Church, the center was visited by Bulgarian historians - active members of the Bulgarian Communist Party (Aksinia Dzhurova, Bozhidar Dimitrov, etc.).

The archive of the Abagar cultural center was moved from Rome to Bulgaria in 1997. The Abagar Foundation, established at that time, took care of the archive. A year after the death of Prof. Eldarov in 2011 a woman in Sofia was arrested for illegally selling objects from the archive; the ultimate fate of the archive material is, unfortunately, unknown.

See also https://bg.wikipedia.org/wiki/Български_католически_книжовен_архив_„Абагар“