Columbia subject headings:
Collective memory--History--20th century.
Communism--History--20th century.
Historic sites--History--20th century.
Memorials--History--20th century.
Monuments--History--20th century.
Political persecution--History--20th century.
Harvard subject headings:
Collective memory--History--20th century.
Communism--History--20th century
Historic sites--History--20th century.
Memorials--History--20th century.
Monuments--History--20th century.
Political persecution--History--20th century.
Princeton subject headings:
Collective memory--History--20th century.
Communism--History--20th century.
Historic sites--History--20th century.
Memorials--History--20th century.
Monuments--History--20th century.
Political persecution--History--20th century.