Columbia subject headings:
Harvard subject headings:
Germany (East)--Politics and government.
Germany (East). Ministerium für Staatssicherheit--Biography.
Geyer, Heinz, 1929-2008.
Intelligence service--Germany (East)
Internal security--Germany (East)
Princeton subject headings:
Germany (East)--Politics and government.
Germany (East). Ministerium für Staatssicherheit--Biography.
Geyer, Heinz, 1929-2008.
Internal security--Germany (East)