Columbia subject headings:
Harvard subject headings:
Freedom of the press--Germany (East)--History--Sources.
Germany (East)--Politics and government--Sources.
Underground literature--Germany (East)
Underground press publications--Germany (East)--History--Sources.
Princeton subject headings:
Freedom of the press--Germany (East)--History--Sources.
Germany (East)--Politics and government--Sources.
Underground press publications--Germany (East)--History--Sources.