Columbia subject headings:
Germany--History--20th century--Bibliography.
History, Modern--20th century--Bibliography.
World politics--20th century--Bibliography.
Harvard subject headings:
Germany--History--20th century--Bibliography.
History, Modern--20th century--Bibliography
World politics--20th century--Bibliography.
Princeton subject headings:
Europe--History--20th century--Bibliography.
Germany (West)--History--Bibliography.
History, Modern--20th century--Bibliography.