Columbia subject headings:
Africa--Antiquities--Congresses.
Excavations (Archaeology)--Africa--Congresses.
Geology, Stratigraphic--Quaternary--Congresses.
Geology--Africa--Congresses.
Prehistoric peoples--Africa--Congresses.
Harvard subject headings:
Africa--Antiquities--Congresses.
Excavations (Archaeology)--Africa--Congresses.
Prehistoric peoples--Africa--Congresses.
Princeton subject headings:
Africa--Antiquities--Congresses.
Excavations (Archaeology)--Africa--Congresses.
Prehistoric peoples--Africa--Congresses.