Columbia subject headings:
Education--History--Congresses.
History--Congresses.
Philology--Congresses.
Harvard subject headings:
Education--History--Congresses.
History--Congresses
Language and history--Congresses.
Literature and history--Congresses.
Philology--Congresses.
Princeton subject headings:
Education--History--Congresses.
Language and history--Congresses.
Literature and history--Congresses.
Philology--Congresses.