Columbia subject headings:
Europe--Relations--Scandinavia--Congresses.
Scandinavia--Relations--Europe--Congresses.
Harvard subject headings:
Baltic Sea Region--Civilization--Congresses.
Europe, Central--Relations--Scandinavia--Congresses.
Poland--Relations--Sweden--Congresses.
Scandinavia--Relations--Europe, Central--Congresses.
Sweden--Relations--Poland--Congresses.
Princeton subject headings:
Baltic Sea Region--Civilization--Congresses.
Europe, Central--Relations--Scandinavia--Congresses.
Poland--Relations--Sweden--Congresses.
Scandinavia--Relations--Europe, Central--Congresses.
Sweden--Relations--Poland--Congresses.