Columbia subject headings:
Archives--Turkey--History.
Manuscripts, Turkish--Bulgaria--Sofia--Catalogs.
Narodna biblioteka "Sv. sv. Kiril i Metodiĭ." Orientalski otdel--Catalogs.
Turkey--History--Ottoman Empire, 1288-1918--Sources--Catalogs.
Harvard subject headings:
Bulgaria--Archival resources.
Turkey--History--Ottoman Empire, 1288-1918--Archival resources.
Princeton subject headings:
Manuscripts, Turkish--Bulgaria--Catalogs.
Narodna biblioteka "Kiril i Metodiĭ." Orientalski otdel--Catalogs.
Turkey--History--Ottoman Empire, 1288-1918--Sources--Catalogs.