Columbia subject headings:
Harvard subject headings:
Gustav II Adolf, King of Sweden, 1594-1632.
Sweden--History--Gustav II Adolf, 1611-1632.
Thirty Years' War, 1618-1648
Princeton subject headings:
Gustav II Adolf, King of Sweden, 1594-1632.
Sweden--History--Gustav II Adolf, 1611-1632.
Thirty Years' War, 1618-1648.