Columbia subject headings:
Barracks--Turkey--Erzurum.
Bastions--Turkey--Erzurum.
Erzurum (Turkey)--Buildings, structures, etc.
Harvard subject headings:
Barracks--Turkey--Erzurum.
Bastions--Turkey--Erzurum.
Erzurum (Turkey)--Buildings, structures, etc.
Princeton subject headings:
Barracks--Turkey--Erzurum.
Bastions--Turkey--Erzurum.
Erzurum (Turkey)--Buildings, structures, etc.