Columbia subject headings:
Harvard subject headings:
Germany (East)--History--Pictorial works.
Germany (East)--History--Sources.
Germany (East)--History.
Germany (East)--Politics and government--Sources.
Hammer, Jean-Pierre, 1927---Travel--Germany (East)
Opposition (Political science)--Germany (East)--History--Sources.
Princeton subject headings:
Germany (East)--History--Pictorial works.
Germany (East)--History--Sources.
Germany (East)--History.
Germany (East)--Politics and government--Sources.
Hammer, Jean-Pierre, 1927---Travel--Germany (East).
Opposition (Political science)--Germany (East)--History--Sources.