Columbia subject headings:
Architecture--Spain--History--20th century--Catalogs.
Architecture--Spain--History--21st century--Catalogs.
Espinet & Ubach--Catalogs.
Harvard subject headings:
Architecture--Spain--20th century
Architecture--Spain--21st century
Espinet & Ubach--Catalogs.
Princeton subject headings:
Architecture, Modern--20th century.
Architecture, Modern--21st century.
Espinet & Ubach.