Columbia subject headings:
Europe--Historiography--20th century.
Europe--History--20th century.
Social sciences--Europe--History--20th century.
Harvard subject headings:
Europe--Historiography--20th century.
Europe--History--20th century.
Social sciences--Europe--History--20th century.
Princeton subject headings:
Europe--Historiography--20th century.
Europe--History--20th century.
Social sciences--Europe--History--20th century.