Columbia subject headings:
Palestine--History--638-1917.
Ẓāhir al-ʻUmar, active 1750-1775.
Harvard subject headings:
Palestine--History--638-1917
Ẓāhir al-ʻUmar, active 1750-1775
Princeton subject headings:
Palestine--History--638-1917.
Ẓāhir al-ʻUmar, active 1750-1775.