Columbia subject headings:
Low German language--Congresses.
Scandinavia--Languages--Congresses.
Harvard subject headings:
Low German language--Congresses.
Scandinavia--Languages--Congresses.
Princeton subject headings:
Low German language--Grammar, Comparative--Scandinavian--Congresses.
Low German language--History--Congresses.
Scandinavian languages--Grammar, Comparative--Low German--Congresses.