Columbia subject headings:
Irrigation--Jordan--History.
Jordan--Antiquities.
Nabataeans.
Water-supply engineering.
Harvard subject headings:
Hydraulic engineering--Jordan--History.
Irrigation engineering--Jordan--History.
Nabataeans.
Petra (Extinct city)
Water-supply engineering--Jordan--History.
Princeton subject headings:
Irrigation.
Nabataeans.
Water-supply engineering.