Columbia subject headings:
Sahara--Civilization.
Sahara--Colonial influence.
Sahel--Civilization.
Sahel--Colonial influence.
Harvard subject headings:
Africa, North--Colonial influence.
Africa, North--History.
Africa, North--Social life and customs.
Europe--Colonies--Africa, North--History.
Sahara--Civilization.
Sahel--Civilization.
Princeton subject headings:
Sahara--Civilization.
Sahel--Civilization.