Columbia subject headings:
Castles--Turkey--Erzurum İli--History.
Castles--Turkey--Kars İli--History.
Erzurum İli (Turkey)--History.
Kars İli (Turkey)--History.
Military architecture--Turkey--Erzurum İli--History.
Military architecture--Turkey--Kars İli--History.
Harvard subject headings:
Architecture, Ottoman--Turkey, Eastern.
Castles--Turkey, Eastern.
Turkey, Eastern--History.
Princeton subject headings:
Castles--Turkey--Erzurum İli--History.
Castles--Turkey--Kars İli--History.
Erzurum İli (Turkey)--History.
Kars İli (Turkey)--History.
Military architecture--Turkey--Erzurum İli--History.
Military architecture--Turkey--Kars İli--History.