Columbia subject headings:
Germany--History--1815-1866--Sources--Bibliography.
Germany--History--1848-1870--Sources--Bibliography.
Harvard subject headings:
Germany--History--1815-1866--Sources--Bibliography.
Germany--History--1848-1870--Sources--Bibliography.
Princeton subject headings:
Germany--History--1815-1866--Sources--Bibliography.
Germany--History--1848-1870--Sources--Bibliography.