Columbia subject headings:
Architecture, Romanesque--Spain--Madrid--Encyclopedias.
Art, Romanesque--Spain--Madrid--Encyclopedias.
Art, Spanish--Spain--Madrid--Encyclopedias.
Harvard subject headings:
Architecture, Romanesque--Spain--Madrid (Region)--Encyclopedias.
Art, Romanesque--Spain--Madrid (Region)--Encyclopedias.
Art, Spanish--Spain--Madrid (Region)--Encyclopedias.
Princeton subject headings:
Architecture, Romanesque--Spain--Madrid (Region)--Encyclopedias.
Art, Romanesque--Spain--Madrid (Region)--Encyclopedias.
Art, Spanish Romanesque--Spain--Madrid (Region)--Encyclopedias.