Columbia subject headings:
Communism and society.
Marx, Karl, 1818-1883.
Revolutions.
Socialism.
Harvard subject headings:
Communism and society.
Marx, Karl, 1818-1883
Revolutions
Socialism
Socialism.
Princeton subject headings:
Communism and society.
Marx, Karl, 1818-1883.
Revolutions.
Socialism.