Columbia subject headings:
Harvard subject headings:
German language--Germany (East)--History--Congresses.
German language--Middle High German, 1050-1500--Congresses.
German language--Written German--History--Congresses.
Princeton subject headings:
German language--Germany (East)--History--Congresses.
German language--Middle High German, 1050-1500--Congresses.
German language--Written German--History--Congresses.