Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Civilization--Congresses.
Greeks--Balkan Peninsula--History--Congresses.
Middle East--Civilization--Congresses.
Princeton subject headings:
Balkan Peninsula--Civilization--Greek influences--Congresses.
Balkan Peninsula--Relations--Greece--Congresses.
Greece--Relations--Balkan Peninsula--Congresses.
Orthodoxos Ekklēsia tēs Hellados--History--Congresses.