Columbia subject headings:
Bibliographies.
German language--20th century--Bibliography.
Germany--Politics and government--20th century--Bibliography.
Harvard subject headings:
German language--Germany--Bibliography.
German language--Germany--History.
German language--Germany--Usage--Bibliography.
German language--Germany--Usage--History.
Germany--Languages--History.
Princeton subject headings:
German language--20th century--Bibliography.
Germany--Politics and government--20th century--Bibliography.