Columbia subject headings:
Economics, Prehistoric--Nigeria--Niger River Delta.
Excavations (Archaeology)--Nigeria--Niger River Delta.
Niger River Delta (Nigeria)--Antiquities.
Niger River Delta (Nigeria)--History.
Prehistoric peoples--Nigeria--Niger River Delta.
Harvard subject headings:
Archaeology--Nigeria--Niger River Delta.
Niger River Delta (Nigeria)--Antiquities.
Niger River Delta (Nigeria)--History.
Princeton subject headings:
Economics, Prehistoric--Nigeria--Niger River Delta.
Excavations (Archaeology)--Nigeria--Niger River Delta.
Niger River Delta (Nigeria)--Antiquities.
Niger River Delta (Nigeria)--History.
Prehistoric peoples--Nigeria--Niger River Delta.