Columbia subject headings:
Intellectuals--History--Congresses.
Middle class--History--Congresses.
Professions--History--Congresses.
Harvard subject headings:
Intellectual life--Congresses.
Intellectuals--History--Congresses.
Middle class--History--Congresses.
Professions--History--Congresses.
Princeton subject headings:
Intellectuals--History--Congresses.
Middle class--History--Congresses.
Professions--History--Congresses.