Columbia subject headings:
Harvard subject headings:
Arab countries--History
Crusades
Dead Sea (Israel and Jordan)--History.
Jordan River--History.
Nile River--History.
Rivers--Arab countries--History--Sources.
Rivers--Israel--History--Sources.
Princeton subject headings:
Arab countries--History.
Crusades.
Dead Sea (Israel and Jordan)--History.
Jordan River--History.
Nile River--History.
Rivers--Arab countries--History--Sources.
Rivers--Israel--History--Sources.