Columbia subject headings:
Cologne (Germany)--History.
Cologne (Germany)--Politics and government.
Germany--Politics and government--1517-1648.
Holy Roman Empire. Reichstag.
Harvard subject headings:
Cologne (Germany)--History.
Cologne (Germany)--Politics and government.
Holy Roman Empire--History--1517-1648.
Holy Roman Empire--Politics and government.
Holy Roman Empire. Reichstag.
Legislative bodies--Germany--History--16th century.
Princeton subject headings: