Columbia subject headings:
Popper, Karl R. (Karl Raimund), 1902-1994--Congresses.
Science--Philosophy--Congresses.
Science.
Harvard subject headings:
Popper, Karl R. (Karl Raimund), 1902-1994--Views on science--Congresses.
Science--Philosophy--Congresses
Princeton subject headings:
Popper, Karl Raimund, Sir, 1902---Criticism and interpretation--Congresses.
Science--Methodology--Congresses.
Science--Philosophy--Congresses.