Columbia subject headings:
Harvard subject headings:
Espionage, German--Iran--History--20th century.
Germany--Foreign relations--Iran.
Iran--Foreign relations--Germany.
Iran--History--20th century.
Tribes--Iran.
Princeton subject headings:
Espionage, German--Iran--History--20th century.
Germany--Foreign relations--Iran.
Iran--Foreign relations--Germany.
Iran--History--20th century.
Tribes--Iran.