Columbia subject headings:
Harvard subject headings:
Aḥmad, king of Yemen, 1891-1962.
Yemen (Republic)--History--Sources.
Yemen (Republic)--Politics and government--Sources.
Princeton subject headings:
Aḥmad, Imam of Yemen, 1893-1962.
United States--Foreign relations--Yemen--Sources.
Yemen--Foreign relations--United States--Sources.
Yemen--History--Sources.
Yemen--Politics and government--Sources.