Columbia subject headings:
Architecture, Early Christian--Spain--Catalonia--Congresses.
Church architecture--Spain--Catalonia--Congresses.
Harvard subject headings:
Architecture, Early Christian--Spain--Catalonia--Congresses.
Church architecture--Spain--Catalonia--Congresses.
Princeton subject headings:
Architecture, Early Christian--Spain--Catalonia--Congresses.
Church architecture--Spain--Catalonia--Congresses.