Columbia subject headings:
Akademisches und Real-Gymnasium (Hamburg, Germany)--History--Congresses.
Education, Higher--Germany--Hamburg--History--Congresses.
Harvard subject headings:
Akademisches und Real-Gymnasium (Hamburg, Germany)--History--Congresses.
Education, Higher--Germany--Hamburg--History--Congresses.
Princeton subject headings:
Akademisches und Real-Gymnasium (Hamburg, Germany)--History--Congresses.
Education, Higher--Germany--Hamburg--History--Congresses.