Columbia subject headings:
Historical sociology--Congresses.
History--Congresses.
Industrial sociology--Congresses.
Social history--Congresses.
Sociology--Congresses.
Harvard subject headings:
Historical sociology--Congresses.
History.
Industrial sociology--Congresses.
Social history--Congresses
Sociology.
Princeton subject headings:
Historical sociology--Congresses.
History--Congresses.
Industrial sociology--Congresses.
Social history--Congresses.
Sociology--Congresses.