Columbia subject headings:
Harvard subject headings:
Austria--History--1848-1867.
Denmark--History--1849-1866.
Prussia (Germany)--History--1815-1870.
Schleswig-Holstein War, 1864.
Princeton subject headings:
Austria--History--1848-1867.
Denmark--History--1849-1866.
Prussia (Germany)--History--1815-1870.
Schleswig-Holstein War, 1864.