Columbia subject headings:
Harvard subject headings:
Boom, Pierre.
Espionage--Germany (West)
Fathers and sons--Germany (West)--Biography.
Germany (East)--Politics and government.
Guillaume, Günter, 1926-
Guillaume, Günter, 1926-1995.
Princeton subject headings:
Boom, Pierre.
Espionage, East German--Germany (West)--History.
Guillaume, Günter, 1926---Family.