Columbia subject headings:
Harvard subject headings:
Najd (Saudi Arabia)--History.
Najd (Saudi Arabia)--Intellectual life.
Saudi Arabia--History--1517-1798.
Ulama--Saudi Arabia--Njad.
Princeton subject headings:
Dirʻīyah (Saudi Arabia)--Social conditions--18th century.
Dirʻīyah (Saudi Arabia)--Social conditions--19th century.