Columbia subject headings:
Harvard subject headings:
Crete (Greece)--History--Venetian rule, 1204-1669.
Fortification--Greece--Rethymnon.
Rethymnon (Greece)--Buildings, structures, etc.
Princeton subject headings:
Fortification--Greece--Rethymnon.
Rethymnon (Greece)--Buildings, structures, etc.