Columbia subject headings:
Harvard subject headings:
Bilingualism
German language--Middle High German, 1050-1500--Dialects.
German language--Old High German, 750-1050--Dialects.
German literature--18th century--Criticism, Textual.
German literature--19th century--Criticism, Textual.
German literature--20th century--Criticism, Textual.
Low German language--Dialects.
Princeton subject headings:
Authors, Low German--History and criticism.
German literature--Germany, Northern--History and criticism.
Low German literature--History and criticism.