Columbia subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Heidegger, Martin, 1889-1976.
Harvard subject headings:
Hegel, Georg Wilhelm Friedrich, 1770-1831
Heidegger, Martin, 1889-1976
Princeton subject headings:
Dualism.
Hegel, Georg Wilhelm Friedrich, 1770-1831--Contributions in ontology.
Heidegger, Martin, 1889-1976.
Phenomenology.