Columbia subject headings:
Harvard subject headings:
Europe--Politics and government--1918-1945.
Labor movement--Europe--History--20th century.
Revolutions--Europe--History--20th century.
Social change--Europe--History--20th century.
Princeton subject headings:
Europe--Politics and government--1918-1945.
Labor movement--Europe--History--20th century.
Revolutions--Europe--History--20th century.
Social change--Europe--History--20th century.