Columbia subject headings:
Yemen (Republic)--History.
Yemen (Republic)--Kings and rulers.
Yemen (Republic)--Politics and government--19th century.
Ḥaḍramawt (Yemen : Province)--History.
Harvard subject headings:
Ḥaḍramawt (Yemen : Province)--History.
Yemen (Republic)--History.
Yemen (Republic)--Kings and rulers--History.
Yemen (Republic)--Politics and government--19th century.
Princeton subject headings: