Columbia subject headings:
Harvard subject headings:
Espionage--Germany (East)--History--Sources.
Germany (East)--History--Sources.
Germany (East)--Politics and government--Sources.
Germany (East). Ministerium für Staatssicherheit--History--Sources.
Germany (East). Ministerium für Staatssicherheit.
Intelligence service--Germany (East)--History--Sources.
Internal security--Germany (East)--History--Sources.
Princeton subject headings:
Espionage--Germany (East)--History--Sources.
Germany (East). Ministerium für Staatssicherheit--History--Sources.
Intelligence service--Germany (East)--History--Sources.
Internal security--Germany (East)--History--Sources.