Columbia subject headings:
Harvard subject headings:
Germany (East)--Politics and government.
Germany (West)--Foreign relations--Germany (East)
Political prisoners--Germany (East)
Princeton subject headings:
Germany (East)--Emigration and immigration--Government policy.
Germany (East)--Foreign relations--Germany (West)
Germany (East). Ministerium für Staatssicherheit
Germany (West)--Foreign relations--Germany (East)
Political prisoners--Germany (East)
Secret service--Germany (East)
Secret service--Germany (West).