Columbia subject headings:
Harvard subject headings:
Europe, Eastern--History--19th century.
Europe, Eastern--History--20th century.
Europe, Eastern--Relations.
History, Modern--19th century
History, Modern--20th century
World history
Princeton subject headings:
Europe, Eastern--History--19th century.
Europe, Eastern--History--20th century.
History, Modern--19th century.
History, Modern--20th century.
World history.