Columbia subject headings:
Architecture--Conservation and restoration--Italy--Tortona.
Architecture--Italy--Tortona.
Art--Conservation and restoration--Italy--Tortona.
Art--Italy--Tortona.
Tortona (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Medieval--Italy--Tortona.
Architecture--Conservation and restoration--Italy--Tortona.
Architecture--Italy--Tortona--Conservation and restoration.
Architecture--Italy--Tortona.
Art, Medieval--Italy--Tortona.
Art--Conservation and restoration--Italy--Tortona.
Art--Italy--Tortona.
Tortona (Italy)--Buildings, structures, etc.
Princeton subject headings: