Columbia subject headings:
Constitutional law--Holy Roman Empire.
Holy Roman Empire--History--Charles V, 1519-1556.
Harvard subject headings:
Germany--History--1517-1648.
Germany--Politics and government--1517-1648.
Princeton subject headings:
Constitutional history--Holy Roman Empire.
Holy Roman Empire--History--Charles V, 1519-1556.
Holy Roman Empire. Reichstag--History.
Legislative bodies--Holy Roman Empire--History.