Columbia subject headings:
Deutscher Bund (1815-1866)
Prussia (Germany)--History--Frederick William IV, 1840-1861--Sources.
Prussia (Germany)--Politics and government--1840-1861.
Harvard subject headings:
Deutscher Bund (1815-1866)
Prussia (Germany)--History--Frederick William IV, 1840-1861--Sources.
Prussia (Germany)--Politics and government--1840-1861.
Princeton subject headings:
Prussia (Germany)--History--1815-1870--Sources.
Prussia (Germany)--Politics and government--1815-1870--Sources.