Columbia subject headings:
German language--Middle High German, 1050-1500--Grammar.
German language--Old High German, 750-1050--Grammar.
Harvard subject headings:
German language--Middle High German, 1050-1500--Grammar.
German language--Middle High German--Grammar.
German language--Old High German, 750-1050--Grammar
German language--Old High German--Grammar.
Princeton subject headings: