Columbia subject headings:
Ethics--Congresses.
Logical positivism--Congresses.
Values--Congresses.
Vienna circle--Congresses.
Harvard subject headings:
Ethics--Congresses
Logical positivism--Congresses.
Values--Congresses
Vienna circle--Congresses.
Princeton subject headings:
Ethics--Congresses.
Logical positivism--Congresses.
Values--Congresses.
Vienna circle--Congresses.