Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--Buildings, structures, etc.
Communism--Germany--History--20th century
Communists--Monuments--Germany (East)
Communists--Monuments--Germany.
Germany--Politics and government--20th century
Monuments--Germany--Berlin.
Revolutionaries--Monuments--Germany (East)
Revolutionaries--Monuments--Germany.
Princeton subject headings:
Socialism--Germany (East)--History.