Columbia subject headings:
Coast defenses--Spain--Cádiz--History.
Fortification--Spain--Cádiz--History.
Military architecture--Spain--Cádiz--History.
Military engineering--Spain--Cádiz--History.
Spain--Defenses--History.
Spain. Armada--History.
Harvard subject headings:
Coast defenses--Spain--Cádiz--History.
Fortification--Spain--Cádiz--History.
Military architecture--Spain--Cádiz--History.
Military engineering--Spain--Cádiz--History.
Spain--Defenses--History.
Spain. Armada--History.
Princeton subject headings: