Columbia subject headings:
Architecture, Domestic--Italy--Bologna.
Bologna (Italy)--Buildings, structures, etc.
Roofs--Italy--Bologna.
Harvard subject headings:
Architecture, Domestic--Italy--Bologna.
Bologna (Italy)--Buildings, structures, etc.
Roofs--Italy--Bologna.
Princeton subject headings:
Bologna (Italy)--Buildings, structures, etc.
Decks (Architecture, Domestic)--Italy--Bologna.
Roofs--Italy--Bologna.