Columbia subject headings:
Humanities--History--Congresses.
Humanities--Philosophy--Congresses.
Sociology--History--Congresses.
Sociology--Philosophy--Congresses.
Harvard subject headings:
Humanities--History--Congresses.
Humanities--Philosophy--Congresses.
Sociology--History--Congresses.
Sociology--Philosophy--Congresses
Princeton subject headings:
Humanities--History--Congresses.
Humanities--Philosophy--Congresses.
Sociology--History--Congresses.
Sociology--Philosophy--Congresses.