Columbia subject headings:
Harvard subject headings:
Lenin, Vladimir Ilʹich, 1870-1924
Marx, Karl, 1818-1883
Proudhon, P.-J. (Pierre-Joseph), 1809-1865.
Revolutions
Socialism
Sorel, Georges, 1847-1922
Princeton subject headings:
Lenin, Vladimir Ilʹich, 1870-1924.
Marx, Karl, 1818-1883.
Proudhon, P.-J. (Pierre-Joseph), 1809-1865.
Revolutions.
Socialism.
Sorel, Georges, 1847-1922.