Columbia subject headings:
Architecture, Romanesque--Spain--Burgos (Province)--Guidebooks.
Architecture, Romanesque--Spain--Cantabria--Guidebooks.
Architecture, Romanesque--Spain--Palencia (Province)--Guidebooks.
Harvard subject headings:
Architecture, Romanesque--Spain--Burgos (Province)--Guidebooks.
Architecture, Romanesque--Spain--Cantabria--Guidebooks.
Architecture, Romanesque--Spain--Palencia (Province)--Guidebooks.
Princeton subject headings:
Architecture, Romanesque--Spain--Burgos (Province)--Guidebooks.
Architecture, Romanesque--Spain--Cantabria--Guidebooks.
Architecture, Romanesque--Spain--Palencia (Province)--Guidebooks.
Guidebooks.