Columbia subject headings:
Harvard subject headings:
Erzurum (Turkey)--History.
Seljuks--Turkey--Erzurum.
Seljuks--Turkey--History.
Turkey--History--To 1453.
Princeton subject headings:
Erzurum (Turkey)--History.
Seljuks--Turkey--Erzurum.
Seljuks--Turkey--History.
Turkey--History--To 1453.