Columbia subject headings:
Architecture, Domestic--Spain--Vizcaya--History--20th century.
City planning--Spain--Vizcaya--History--20th century.
Low-income housing--Spain--Vizcaya--History--20th century.
Harvard subject headings:
Princeton subject headings:
Architecture, Domestic--Spain--Vizcaya--History--20th century.
City planning--Spain--Vizcaya--History--20th century.
Low-income housing--Spain--Vizcaya--History--20th century.