Columbia subject headings:
Harvard subject headings:
Education--France--History--Congresses.
Education--Germany--History--Congresses.
Education--Switzerland--History--Congresses.
Schools--France--History--Congresses.
Schools--Germany--History--Congresses.
Schools--Switzerland--History--Congresses.
Princeton subject headings:
Education--France--History--Congresses.
Education--Germany--History--Congresses.
Education--Switzerland--History--Congresses.
Schools--France--History--Congresses.
Schools--Germany--History--Congresses.
Schools--Switzerland--History--Congresses.