Columbia subject headings:
Communism--History--19th century.
Marx, Karl, 1818-1883. Manifest der Kommunistischen Partei.
Socialism--History--19th century.
Harvard subject headings:
Communism--History--19th century
Socialism--History--19th century
Princeton subject headings:
Communism--History--19th century.
Marx, Karl, 1818-1883. Manifest der Kommunistischen Partei.
Socialism--History--19th century.