Columbia subject headings:
Dialectic--History.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Marx, Karl, 1818-1883.
Science--Philosophy--History.
Harvard subject headings:
Dialectic--History.
Hegel, Georg Wilhelm Friedrich, 1770-1831
Marx, Karl, 1818-1883
Science--Philosophy--History
Princeton subject headings:
Dialectic--History.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Marx, Karl, 1818-1883.
Science--Philosophy--History.