Columbia subject headings:
Architecture, Romanesque--Congresses.
Architecture--Details--Congresses.
Harvard subject headings:
Architecture, Romanesque--Spain.
Church architecture--Spain.
Liturgy and architecture--Spain.
Space (Architecture)--Spain.
Princeton subject headings:
Architecture, Romanesque--Spain.
Church architecture--Spain.
Liturgy and architecture--Spain.
Space (Architecture)--Spain.