Columbia subject headings:
Dialectic--History--19th century.
Dialectic.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Harvard subject headings:
Dialectic--History--19th century.
Hegel, Georg Wilhelm Friedrich, 1770-1831--Contributions in dialectic.
Princeton subject headings:
Dialectic--History--19th century.
Hegel, Georg Wilhelm Friedrich, 1770-1831.