Columbia subject headings:
Europe--Relations--Switzerland--Congresses.
Neuchâtel (Switzerland)--History--Congresses.
Switzerland--Relations--Europe--Congresses.
Harvard subject headings:
Europe--Relations--Switzerland--Congresses.
Neuchâtel (Switzerland)--History--Congresses.
Switzerland--Relations--Europe--Congresses.
Princeton subject headings:
Europe--Relations--Switzerland--Congresses.
Neuchâtel (Switzerland)--History--Congresses.
Switzerland--Relations--Europe--Congresses.