The Byzantine Catholic Seminary Library specializes in Eastern Christianity, Catholic dogma, prostopinije (liturgical chant), and Carpatho-Rusyn, Slovak, and Ukrainian culture. With nearly 25,000 cataloged items, 150 periodicals, and growing electronic resources, it holds unique theological and historical materials from the 16th to the 21st century. The collection includes manuscripts, printed books, and non-print media, focusing on the Byzantine Catholic and Eastern Orthodox Churches, their theology, history, and liturgical music. A photo archive was recently added along with rare Prostopinije sheet music.