Columbia subject headings:
Harvard subject headings:
Economic history--19th century.
Economic history--20th century
History, Modern--19th century
History, Modern--20th century
Hobsbawm, E. J. (Eric J.), 1917---Bibliography.
Social history--19th century
Social history--20th century
World politics--19th century
World politics--20th century
Princeton subject headings:
History, Modern--19th century.
History, Modern--20th century.
World politics--19th century.
World politics--20th century.