Columbia subject headings:
Harvard subject headings:
Conspiracies--Europe--History--Congresses.
Elite (Social sciences)--Europe--History--Congresses.
Secret societies--Europe--History--Congresses.
Universities and colleges--Social aspects--Europe--History--Congresses.
Princeton subject headings:
Elite (Social sciences)--Congresses.
Freemasons--History--Congresses.
Secret societies--History--Congresses.