Columbia subject headings:
Spain--Foreign relations--1516-1700.
Thirty Years' War, 1618-1648--Diplomatic history.
Harvard subject headings:
Spain--Foreign relations--1516-1700.
Thirty Years' War, 1618-1648--Diplomatic history.
Princeton subject headings:
Italy--Foreign relations--Switzerland.
Italy--History--1559-1789.
Spain--Foreign relations--Switzerland.
Spain--History--Philip III, 1598-1621.
Switzerland--Foreign relations--Italy.
Switzerland--Foreign relations--Spain.
Switzerland--History--1499-1648.