Columbia subject headings:
Clarke, W. Norris (William Norris), 1915-2008.
Metaphysics.
Harvard subject headings:
Clarke, W. Norris (William Norris), 1915-2008
Clarke, W. Norris (William Norris), 1915-2008--Bibliography.
Metaphysics
Ontology.
Religion--Philosophy
Thomists.
Princeton subject headings:
Clarke, W. Norris (William Norris), 1915-
Metaphysics.