Columbia subject headings:
Harvard subject headings:
Armstrong, D. M. (David M.), 1941---Correspondence.
Armstrong, D. M. (David Malet), 1926-2014--Correspondence.
Grossmann, Reinhardt, 1931---Correspondence.
Metaphysics
Natural law
Numerals--Philosophy.
Ontology.
Realism.
Universals (Philosophy)
Whole and parts (Philosophy)
Princeton subject headings:
Armstrong, D. M. (David Malet), 1926-2014--Correspondence.
Grossmann, Reinhardt, 1931---Correspondence.
Metaphysics.