Columbia subject headings:
Art, Italian--Italy--Bologna.
Bologna (Italy)--Relations--Spain.
Italy--Relations--Spain.
Spain--Relations--Italy--Bologna.
Harvard subject headings:
Art, Italian--Italy--Bologna.
Art, Spanish--Italian influences.
Bologna (Italy)--Relations--Spain.
Spain--Relations--Italy--Bologna.
Princeton subject headings:
Art, Italian--Italy--Bologna.
Bologna (Italy)--Relations--Spain.
Italy--Relations--Spain.
Spain--Relations--Italy--Bologna.