Columbia subject headings:
Espionage, East German--History--Sources.
Germany (East). Ministerium für Staatssicherheit--Archives.
Germany (East). Ministerium für Staatssicherheit--History--Sources.
Harvard subject headings:
Espionage, East German--History.
Germany (East). Ministerium für Staatssicherheit--Archives.
Germany (East). Ministerium für Staatssicherheit--History.
Intelligence service--Germany (East)--History.
Princeton subject headings:
Espionage, East German--History--Sources.
Germany (East). Ministerium für Staatssicherheit--Archives.
Germany (East). Ministerium für Staatssicherheit--History--Sources.