Columbia subject headings:
Harvard subject headings:
Spain--History, Military--17th century.
Spain--History--Philip IV, 1621-1665.
Spain. Ejército--History--17th century.
Thirty Years' War, 1618-1648--Participation, Spanish.
Princeton subject headings:
Spain--History, Military--17th century.
Spain--History--Philip IV, 1621-1665.
Spain. Ejército--History--17th century.