Columbia subject headings:
Chersonese (Extinct city)
Ereğli (Zonguldak İli, Turkey)
Harvard subject headings:
Chersonese (Extinct city)
Crimea (Ukraine)--History.
Ereğli (Zonguldak İli, Turkey)
Ereğli (Zonguldak İli, Turkey)--History.
Pontus--History.
Princeton subject headings:
Chersonese (Extinct city)
Ereğli (Zonguldak İli, Turkey)
Krymskai︠a︡ oblastʹ (Ukraine)--History.
Pontus--History.