Columbia subject headings:
Agricultural colonies--Spain--History--20th century.
Agriculture and state--Spain--History--20th century.
Land settlement--Spain--History--20th century.
Spain--Rural conditions--Pictorial works.
Vernacular architecture--Spain--Pictorial works.
Villages--Spain--Pictorial works.
Water-supply--Spain--Pictorial works.
Harvard subject headings:
Agricultural colonies--Spain--History--20th century.
Agriculture and state--Spain--History--20th century.
Land settlement--Spain--History--20th century.
Spain--Rural conditions--Pictorial works.
Vernacular architecture--Spain--Pictorial works.
Villages--Spain--Pictorial works.
Water-supply--Spain--Pictorial works.
Princeton subject headings:
Agricultural colonies--Spain--History--20th century.
Agriculture and state--Spain--History--20th century.
Land settlement--Spain--History--20th century.
Spain--Rural conditions--Pictorial works.
Vernacular architecture--Spain--Pictorial works.
Villages--Spain--Pictorial works.
Water-supply--Spain--Pictorial works.