Columbia subject headings:
Harvard subject headings:
Europe--Civilization--20th century.
Europe--Economic conditions--1918-1945.
Europe--Politics and government--1918-1945.
Europe--Social conditions--20th century.
European cooperation.
Princeton subject headings:
Europe--Civilization--20th century.
Europe--Economic conditions--1918-1945.
Europe--Politics and government--1918-1945.
Europe--Social conditions--20th century.
European cooperation.