Columbia subject headings:
Hardenberg, Karl August, Fürst von, 1750-1822.
Prussia (Germany)--Politics and government--1815-1870.
Harvard subject headings:
Hardenberg, Karl August, Fürst von, 1750-1822.
Prussia (Germany)--Politics and government--1815-1870.
Princeton subject headings:
Hardenberg, Karl August, Fürst von, 1750-1822.
Prussia (Germany)--Politics and government--1815-1870.