Columbia subject headings:
Agricultural engineering--Arabian Peninsula--History.
Irrigation canals and flumes--Arabian Peninsula--History.
Irrigation engineering--Arabian Peninsula--History.
Harvard subject headings:
Agriculture--Arab countries--History.
Irrigation canals and flumes--Arab countries--History.
Irrigation engineering--Arab countries--History.
Princeton subject headings:
Agriculture--Arab countries--History.
Irrigation canals and flumes--Arab countries--History.
Irrigation engineering--Arab countries--History.