Columbia subject headings:
Harvard subject headings:
Concepts--Congresses.
Language and languages--Philosophy--Congresses
Object (Philosophy)
Object (Philosophy)--Congresses.
Ontology--Congresses.
Philosophy, Modern--Congresses.
Strawson, P. F.--Congresses.
Princeton subject headings:
Object (Philosophy)--Congresses.
Strawson, P. F.--Congresses.