Columbia subject headings:
Architecture, Byzantine--Balkan Peninsula.
Architecture, Early Christian--Balkan Peninsula.
Christian antiquities--Balkan Peninsula--Congresses.
Christian antiquities--Byzantine Empire.
Christian antiquities--Congresses.
Church architecture--Balkan Peninsula.
Harvard subject headings:
Christian antiquities--Congresses.
Princeton subject headings:
Christian antiquities--Congresses.
Illyrian antiquities--Congresses.