Columbia subject headings:
Agriculture--Spain--History.
Gardens--Spain--History.
Islamic gardens--History.
Landscape architecture--Spain--History.
Palaces--Spain--History.
Harvard subject headings:
Agriculture--Spain--History.
Gardens--Spain--History.
Islamic architecture--Spain
Islamic gardens--History.
Landscape architecture--Spain--History.
Palaces--Spain--History.
Princeton subject headings:
Agriculture--Spain--History.
Gardens--Spain--History.
Islamic gardens--History.
Landscape architecture--Spain--History.
Palaces--Spain--History.