Columbia subject headings:
Harvard subject headings:
Europe--History--1789-1900.
Europe--History--20th century.
History, Modern--19th century
History, Modern--20th century
Loth, Wilfried.
Princeton subject headings:
Europe--History--1789-1900.
Europe--History--20th century.
History, Modern--19th century.
History, Modern--20th century.
Loth, Wilfried.