Columbia subject headings:
Feuerbach, Ludwig, 1804-1872.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Marx, Karl, 1818-1883. Deutsche Ideologie.
Philosophy, German--19th century.
Harvard subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831
Marx, Karl, 1818-1883
Philosophy, German--19th century.
Princeton subject headings: