Columbia subject headings:
Popular culture--Europe--History--19th century--Congresses.
Working class--Education--Europe--History--19th century--Congresses.
Harvard subject headings:
Popular culture--Europe--History--19th century--Congresses.
Working class--Education--Europe--History--19th century--Congresses.
Princeton subject headings:
Popular culture--Europe--History--19th century--Congresses.
Working class--Education--Europe--History--19th century--Congresses.