Columbia subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Idealism--History.
Kant, Immanuel, 1724-1804.
Marx, Karl, 1818-1883.
Harvard subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831
Idealism--History.
Kant, Immanuel, 1724-1804
Marx, Karl, 1818-1883
Princeton subject headings: