Columbia subject headings:
Ferdinand III, Holy Roman Emperor, 1608-1657.
Germany--History--1618-1648.
Holy Roman Empire. Reichstag (1640-1641 : Regensburg, Germany)
Harvard subject headings:
Ferdinand III, Holy Roman Emperor, 1608-1657.
Germany--History--1618-1648.
Holy Roman Empire. Reichstag (1640-1641 : Regensburg, Germany)
Thirty Years' War, 1618-1648
Princeton subject headings:
Ferdinand III, Holy Roman Emperor, 1608-1657.
Germany--History--1618-1648.
Ratisbon, Diet of, 1640-1641.