Columbia subject headings:
Harvard subject headings:
Camels--History.
Donkeys--History.
Mules--History.
Transportation--Egypt.
Transportation--History
Working animals--History.
Princeton subject headings:
Camels--Egypt--History--To 1500--Sources.
Draft animals--Egypt--History--To 1500--Sources.
Mules--Egypt--History--To 1500--Sources.
Transportation--Egypt--History--To 1500--Sources.
Working animals--Egypt--History--To 1500--Sources.