Columbia subject headings:
Harvard subject headings:
Civilization--Congresses
Culture--Congresses.
Idea (Philosophy)--Congresses.
Power (Social sciences)--Congresses
Progress--Congresses
Social change--Congresses
Princeton subject headings:
Civilization--Congresses.
Culture--Congresses.
Idea (Philosophy)--Congresses.
Power (Social sciences)--Congresses.
Progress--Congresses.
Social change--Congresses.