Columbia subject headings:
Harvard subject headings:
Europe--Civilization--20th century.
Europe--History--1918-1945.
Europe--Intellectual life--20th century.
World War, 1914-1918
Princeton subject headings:
Europe--Civilization--20th century.
Europe--History--1918-1945.
Europe--Intellectual life--20th century.
World War, 1914-1918.