Columbia subject headings:
Petroglyphs--Sahara.
Rock paintings--Sahara.
Sahara--Antiquities.
Harvard subject headings:
Africa, North--Antiquities.
Antiquities, Prehistoric--Africa, North.
Petroglyphs--Africa, North.
Prehistoric peoples--Africa, North.
Rock paintings--Africa, North.
Princeton subject headings:
Africa, North--Antiquities.
Petroglyphs--Africa, North.
Prehistoric peoples--Africa, North.
Rock paintings--Africa, North.