Columbia subject headings:
Harvard subject headings:
Culture conflict--Europe--History--20th century.
Discrimination--Europe--History--20th century.
Europe--Social conditions--20th century.
Social conflict--Europe--History--20th century.
Princeton subject headings:
Culture conflict--Europe--History--20th century.
Discrimination--Europe--History--20th century.
Europe--Social conditions--20th century.
Social conflict--Europe--History--20th century.