Columbia subject headings:
Darwin, Charles, 1809-1882.
Human beings--Animal nature.
Marx, Karl, 1818-1883.
Philosophical anthropology.
Social evolution.
Harvard subject headings:
Anthropology--Philosophy
Darwin, Charles, 1809-1882
Human beings--Animal nature
Marx, Karl, 1818-1883
Social evolution.
Princeton subject headings:
Anthropology--Philosophy.
Darwin, Charles, 1809-1882.
Human beings--Animal nature.
Marx, Karl, 1818-1883.
Social evolution.