Columbia subject headings:
German language--Early modern, 1500-1700--Congresses.
German language--Middle High German, 1050-1500--Congresses.
German language--Old High German, 750-1050--Congresses.
Harvard subject headings:
German language--Middle High German, 1050-1500--Grammar, Historical--Congresses.
German language--Old High German, 750-1050--Grammar, Historical--Congresses.
Princeton subject headings: