Columbia subject headings:
Communism--Yemen, South--History.
Germany (East)--Foreign relations--Yemen, South.
Germany (East)--Politics and government--20th century.
Socialism--Yemen, South--History.
Yemen, South--Foreign relations--Germany (East)
Yemen, South--Politics and government.
Harvard subject headings:
Communism--Yemen (People's Democratic Republic)--History.
Germany (East)--Foreign relations--Yemen (People's Democratic Republic)
Germany (East)--Politics and government.
Socialism--Yemen (People's Democratic Republic)--History.
Yemen (People's Democratic Republic)--Foreign relations--Germany (East)
Yemen (People's Democratic Republic)--Politics and government.
Princeton subject headings:
Communism--Yemen, South--History.
Germany (East)--Foreign relations--Yemen, South.
Germany (East)--Politics and government--20th century.
Socialism--Yemen, South--History.
Yemen, South--Foreign relations--Germany (East).
Yemen, South--Politics and government.