Columbia subject headings:
Iron age--Nigeria--Kaduna River Valley.
Kaduna River Valley (Nigeria)--Antiquities.
Nigeria--Antiquities.
Harvard subject headings:
Excavations (Archaeology)--Nigeria--Kaduna River Valley.
Human settlements--Nigeria--Kaduna River Valley.
Kaduna River Valley (Nigeria)--Antiquities.
Prehistoric peoples--Nigeria--Kaduna River Valley.
Princeton subject headings:
Iron age--Nigeria--Kaduna River Valley.
Kaduna River Valley (Nigeria)--Antiquities.
Nigeria--Antiquities.