Columbia subject headings:
Good and evil--History--20th century.
Marcel, Gabriel, 1889-1973.
Ontology--History--20th century.
Harvard subject headings:
Good and evil--History--20th century.
Marcel, Gabriel, 1889-1973.
Ontology--History--20th century.
Princeton subject headings:
Good and evil.
Marcel, Gabriel, 1889-1973.