Columbia subject headings:
Harvard subject headings:
Cleve (Duchy)--Court and courtiers--History--Sources.
Cleve (Duchy)--History--Sources.
Cleve (Duchy)--Politics and government--Sources.
Princeton subject headings:
Cleve (Duchy)--Court and courtiers--History--Sources.
Cleve (Duchy)--History--Sources.
Cleve (Duchy)--Politics and government--Sources.