Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--Balkan Peninsula--Conservation and restoration--Exhibitions.
Architecture, Medieval--Balkan Peninsula--Exhibitions.
Architecture--Balkan Peninsula--Conservation and restoration--Exhibitions.
Architecture--Balkan Peninsula--Exhibitions.
Fortification--Balkan Peninsula--Conservation and restoration--Exhibitions.
Fortification--Balkan Peninsula--Exhibitions.
Princeton subject headings:
Architecture, Medieval--Balkan Peninsula.
Architecture--Conservation and restoration.