Columbia subject headings:
Balkan Peninsula--History--Periodicals--Indexes.
Byzantine Empire--History--Periodicals--Indexes.
Échos d'Orient--Indexes.
Harvard subject headings:
Balkan Peninsula--History--Periodicals--Indexes.
Byzantine Empire--History--Periodicals--Indexes.
Christianity--Middle East--Periodicals--Indexes.
Echos d'Orient--Indexes.
Princeton subject headings: