Columbia subject headings:
Categories (Philosophy)
Hartmann, Nicolai, 1882-1950.
Knowledge, Theory of.
Ontology.
Philosophy and science.
Harvard subject headings:
Hartmann, Nicolai, 1882-1950
Knowledge, Theory of
Naturalism.
Ontology--History--20th century.
Princeton subject headings:
Hartmann, Nicolai, 1882-1950.
Knowledge, Theory of.
Naturalism.
Ontology--History--20th century.