Columbia subject headings:
Animals and history--Africa, North.
Animals and history--Middle East.
Camels--Africa, North--History.
Camels--History.
Camels--Middle East--History.
Transportation--Africa, North--History.
Transportation--Middle East--History.
Wheels--Africa, North--History.
Wheels--Middle East--History.
Harvard subject headings:
Animals and history--Africa, North.
Animals and history--Middle East.
Camels--Africa, North--History.
Camels--History.
Camels--Middle East--History.
Transportation--Africa, North--History.
Transportation--Middle East--History.
Wheels--Africa, North--History.
Wheels--Middle East--History.
Princeton subject headings: