Columbia subject headings:
Harvard subject headings:
Communism
Communists--Germany--Biography
Engels, Friedrich, 1820-1895--Friends and associates.
Marx, Karl, 1818-1883--Friends and associates.
Philosophy, Marxist--History.
Princeton subject headings:
Communism.
Communists--Germany--Biography.
Engels, Friedrich, 1820-1895--Friends and associates.
Marx, Karl, 1818-1883--Friends and associates.
Philosophy, Marxist--History.