Columbia subject headings:
German literature--Germany--Lower Saxony--History and criticism.
Libraries--Germany--History.
Ruppelt, Georg--Bibliography.
Harvard subject headings:
German literature--Germany--Lower Saxony--History and criticism.
Libraries--Germany--History
Ruppelt, Georg--Bibliography.
Princeton subject headings:
German literature--Germany--Lower Saxony--History and criticism.
Libraries--Germany--History.
Ruppelt, Georg--Bibliography.