Columbia subject headings:
Feuerbach, Ludwig, 1804-1872.
Marx, Karl, 1818-1883.
Metaphysics--History.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Harvard subject headings:
Feuerbach, Ludwig, 1804-1872.
Marx, Karl, 1818-1883
Metaphysics--History
Nietzsche, Friedrich Wilhelm, 1844-1900
Princeton subject headings:
Feuerbach, Ludwig, 1804-1872.
Marx, Karl, 1818-1883.
Nietzsche, Friedrich Wilhelm, 1844-1900.