Columbia subject headings:
Fortification--Latin America.
Fortification--Philippines.
Harbors--Latin America.
Harbors--Philippines.
Harvard subject headings:
Fortification--Latin America.
Fortification--Philippines
Harbors--Latin America.
Harbors--Philippines
Princeton subject headings:
Coast defenses--America--History--Exhibitions.
Coast defenses--Philippines--History--Exhibitions.
Fortification--America--History--Exhibitions.
Fortification--Philippines--History--Exhibitions.
Spain--Colonies--America--Defenses--History--Exhibitions.
Spain--Colonies--Oceania--Defenses--History--Exhibitions.