Columbia subject headings:
Harvard subject headings:
Constitutional history--Holy Roman Empire
Holy Roman Empire--History--1273-1517.
Holy Roman Empire--History--1517-1648.
Holy Roman Empire--History--1648-1804.
Holy Roman Empire--Social conditions--16th century.
Holy Roman Empire--Social conditions--17th century.
Princeton subject headings:
Constitutional history--Holy Roman Empire.
Holy Roman Empire--History--1273-1517.
Holy Roman Empire--History--1517-1648.
Holy Roman Empire--History--1648-1804.
Holy Roman Empire--Social conditions--16th century.
Holy Roman Empire--Social conditions--17th century.