Columbia subject headings:
Hartmann, Nicolai, 1882-1950.
Heidegger, Martin, 1889-1976. Ontologie. English.
Ontology.
Harvard subject headings:
Hartmann, Nicolai, 1882-1950
Heidegger, Martin, 1889-1976
Ontology.
Princeton subject headings:
Hartmann, Nicolai, 1882-1950.
Heidegger, Martin, 1889-1976.
Ontology--History--20th century.