The Mehmet Seyfettin Özege Collection consists of 12,569 archival sources. The collection includes photographs, clippings, brochures, biographies, book slips, book lists, greeting cards, invitations, business cards, telegrams, receipts, and invoices. The bibliographical filing cards in the Turkish Works Catalogue are included in the collection. Özege's book records and lists include the books published between 1729 and 1928. Seyfettin Özege (1901-1981) was a book collector and bibliographer.