Columbia subject headings:
Lorenzen, Paul, 1915-1994--Congresses.
Philosophy, Modern--20th century--Congresses.
Harvard subject headings:
Lorenzen, Paul, 1915-1994--Congresses.
Philosophy, Modern--20th century--Congresses.
Princeton subject headings:
Constructivism (Philosophy)--Congresses.
Lorenzen, Paul, 1915-1994--Criticism and interpretation--Congresses.