Columbia subject headings:
Harvard subject headings:
Beer, Harald, 1928-
Beer, Harald--Imprisonment.
Political prisoners--Germany (East)--Biography
Political prisoners--Germany (East)--Biography--Sources.
Political prisoners--Germany--Sachsenhausen (Brandenburg)--History--20th century.
Political prisoners--Germany--Thuringia--History--20th century.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History.
Princeton subject headings:
Beer, Harald, 1928-
Political prisoners--Germany (East)--Biography--Sources.
Political prisoners--Germany (East)--Biography.