Columbia subject headings:
Harvard subject headings:
Mexico City (Mexico)--History
Spain--Colonies--America--Defenses--History--17th century.
Spain--History, Naval--17th century.
Spain. Armada--History--17th century.
Princeton subject headings:
Mexico City (Mexico)--History.
Spain--Colonies--America--Defenses.
Spain--History, Naval.
Spain. Armada--History--17th century.