Columbia subject headings:
Harvard subject headings:
Excavations (Archaeology)--Jordan--Petra (Extinct city)
Jordan--Antiquities.
Nabataeans--History.
Paleohydrology--Jordan--Petra (Extinct city)
Petra (Extinct city)
Princeton subject headings:
Excavations (Archaeology)--Jordan--Petra (Extinct city).
Flood control--Jordan--Petra (Extinct ctiy).
Petra (Extinct city)
Water-supply--Jordan--Petra (Extinct ctiy).