Columbia subject headings:
Harvard subject headings:
Denmark--History--1849-1866.
Germany--History--1848-1870.
Schleswig-Holstein (Germany)--History, Military--19th century.
Schleswig-Holstein War, 1864.
Princeton subject headings:
Denmark--History--1849-1866.
Germany--History--1848-1870.
Schleswig-Holstein (Germany)--History, Military--19th century.
Schleswig-Holstein War, 1864.