Columbia subject headings:
Africa, North--Boundaries--Africa, Sub-Saharan--History--Congresses.
Africa, Sub-Saharan--Boundaries--Africa, North--History--Congresses.
Sahara--History--Congresses.
Harvard subject headings:
Africa, North--Antiquities--Congresses.
Africa, North--Boundaries--History--Congresses.
Africa, North--Civilization--To 1500--Congresses.
Sahara--Antiquities--Congresses.
Sahara--Boundaries--Congresses.
Princeton subject headings:
Africa, North--Antiquities--Congresses.
Africa, North--Boundaries--History--Congresses.
Africa, North--Civilization--To 1500--Congresses.
Sahara--Antiquities--Congresses.
Sahara--Boundaries--Congresses.