Columbia subject headings:
Harvard subject headings:
Espionage, German
Germany (East). Ministerium für Staatssicherheit--Biography.
Intelligence service--Germany (East)--Biography.
Spies--Germany (East)--Biography.
Wolf, Markus, 1923-2006
Princeton subject headings:
Germany (East). Ministerium für Staatssicherheit--Biography.
Germany--Politics and government--1945-1990.
Intelligence service--Germany (East)--Biography.
Spies--Germany--Biography.