Columbia subject headings:
Architecture--Spain--Catalogs.
Palaces--Spain--History.
Patrimonio Nacional--Catalogs.
Harvard subject headings:
Architecture--Spain--Catalogs.
Gardens--Spain
Palaces--Spain
Palaces--Spain--History.
Patrimonio Nacional--Catalogs.
Spain--Kings and rulers--Art patronage.
Princeton subject headings:
Gardens--Spain.
Palaces--Spain.
Spain--Kings and rulers--Art patronage.