Columbia subject headings:
Harvard subject headings:
Rhineland (Germany)--Politics and government--19th century.
Rhineland (Germany)--Politics and government--20th century.
Westphalia (Germany)--Politics and government--19th century.
Westphalia (Germany)--Politics and government--20th century.
Princeton subject headings:
Rhineland (Germany)--Politics and government--19th century.
Rhineland (Germany)--Politics and government--20th century.
Westphalia (Germany)--Politics and government--19th century.
Westphalia (Germany)--Politics and government--20th century.