Columbia subject headings:
Evolution (Biology)--Political aspects--Great Britain--History--19th century.
Evolution (Biology)--Political aspects--Great Britain--History--20th century.
Social Darwinism--Europe--History--19th century.
Social Darwinism--Europe--History--20th century.
Socialism--Europe--History--19th century.
Socialism--Europe--History--20th century.
Harvard subject headings:
Evolution (Biology)--Political aspects--Great Britain--History--19th century.
Evolution (Biology)--Political aspects--Great Britain--History--20th century.
Social Darwinism--Europe--History--19th century.
Social Darwinism--Europe--History--20th century.
Socialism--Europe--History--19th century.
Socialism--Europe--History--20th century
Princeton subject headings:
Evolution (Biology)--Political aspects--Great Britain--History--19th century.
Evolution (Biology)--Political aspects--Great Britain--History--20th century.
Socialism--Europe--History--19th century.
Socialism--Europe--History--20th century.