Columbia subject headings:
Nationalism--Yemen (Republic)
Tribes--Yemen (Republic)
Yemen (Republic)--Ethnic relations.
Yemen (Republic)--Politics and government.
Harvard subject headings:
Nationalism--Yemen (Republic)
Tribes--Yemen (Republic)
Yemen (Republic)--Ethnic relations.
Yemen (Republic)--Politics and government.
Princeton subject headings:
Nationalism--Yemen.
Tribes--Yemen.
Yemen--Ethnic relations.
Yemen--Politics and government.