Columbia subject headings:
Africa, North--Description and travel.
Commerce (Brig)
Sahara--Description and travel.
Slavery--Africa, North.
Harvard subject headings:
Africa, North--Description and travel.
Commerce (Brig)
Sahara--Description and travel.
Slavery--Africa, North
Princeton subject headings:
Africa, North--Description and travel.
Commerce (Brig)
Sahara--Description and travel.
Slavery--Africa, North.