Columbia subject headings:
Harvard subject headings:
Aesthetics, Polish--20th century.
Ingarden, Roman, 1893-1970--Aesthetics.
Ingarden, Roman, 1893-1970--Contributions in ontology.
Ingarden, Roman, 1893-1970--Esthétique.
Ingarden, Roman, 1893-1970--Et l'ontologie.
Ontology--History--20th century.
Princeton subject headings:
Aesthetics, Polish.
Ingarden, Roman, 1893-1970--Aesthetics.
Ingarden, Roman, 1893-1970.
Ontology.