Columbia subject headings:
Art, German--Germany--Palatinate.
Karl II, August, Duke of Pfalz-Zweibrücken, 1746-1795.
Pfalz-Zweibrücken (Duchy)
Schloss Karlsberg.
Wittelsbach, House of--Art collections.
Harvard subject headings:
Castles--Germany--Saarland.
Karl II August, Duke of Pfalz-Zweibrücken, 1746-1795--Palaces--Germany--Saarland.
Schloss Karlsberg (Germany)
Princeton subject headings: