Columbia subject headings:
Europe, Northern--Civilization--Congresses.
Europe, Northern--Languages--Congresses.
Europe, Northern--Literatures--Congresses.
Harvard subject headings:
Europe, Northern--Civilization--Congresses.
Europe, Northern--Languages--Congresses.
Europe, Northern--Literatures--Congresses.
Princeton subject headings:
Europe, Northern--Civilization.
Europe, Northern--Languages--Congresses.
Europe, Northern--Literatures--Congresses.