Columbia subject headings:
Yemen, North--History.
Yemen, North--Social conditions.
Zaydīs--Yemen, North--History.
Harvard subject headings:
Imams (Shiites)--Yemen (Republic)
Imams (Shiites)--Yemen, North.
Yemen (Republic)--History.
Zaydīs--Yemen (Republic)
Princeton subject headings:
Yemen, North--History.
Yemen, North--Social conditions.
Zaydīs--Yemen, North--History.