Columbia subject headings:
Fortification--Greece--Sphakia District.
Phrankokastello (Greece)
Sphakia District (Greece)--History.
Harvard subject headings:
Fortification--Greece--Sphakia District.
Phrankokastello (Greece)
Sphakia District (Greece)--History.
Princeton subject headings:
Fortification--Greece--Sphakia District.
Phrankokastello (Greece)
Sphakia District (Greece)--History.