Columbia subject headings:
Architecture--Italy--Bologna--History.
Architecture--Italy--Emilia--History.
Harvard subject headings:
Architecture--Italy--Bologna.
Architecture--Italy--Emilia-Romagna.
Princeton subject headings:
Architecture--Italy--Bologna.
Architecture--Italy--Emilia.
Bologna (Italy)--Buildings, structures, etc.
Church architecture--Italy--Bologna.
Church architecture--Italy--Emilia.
Decoration and ornament, Architectural--Italy--Bologna.
Decoration and ornament, Architectural--Italy--Emilia.
Mural painting and decoration, Italian--Italy--Bologna.
Mural painting and decoration, Italian--Italy--Emilia.