Columbia subject headings:
Harvard subject headings:
City walls--Cyprus--Nicosia--Congresses.
City walls--Greece--History--Congresses.
Fortification--Cyprus--Nicosia--Congresses.
Nicosia (Cyprus)--Buildings, structures, etc.--Congresses.
Nicosia (Cyprus)--History--Congresses.
Princeton subject headings:
City walls--Cyprus--Nicosia--Congresses.
City walls--Greece--History--Congresses.
Nicosia (Cyprus)--Buildings, structures, etc.--Congresses.