Columbia subject headings:
Imagination--Congresses.
Physics--Philosophy--Congresses.
Reality--Congresses.
Science--Philosophy--Congresses.
Harvard subject headings:
Imagination--Congresses.
Physics--Philosophy--Congresses
Reality--Congresses
Science--Philosophy--Congresses
Princeton subject headings:
Imagination--Congresses.
Physics--Philosophy--Congresses.
Reality--Congresses.
Science--Philosophy--Congresses.