Columbia subject headings:
Harvard subject headings:
Image (Philosophy)--Congresses.
Justification (Theory of knowledge)--Congresses.
Negation (Logic)--Congresses.
Reason--Congresses.
Utopias--Congresses
Princeton subject headings:
Image (Philosophy)--Congresses.
Justification (Theory of knowledge)--Congresses.
Negation (Logic)--Congresses.
Reason--Congresses.
Utopias--Congresses.