Columbia subject headings:
Harvard subject headings:
Architecture--Italy--Romagna--19th century.
Architecture--Italy--Romagna--20th century.
Architecture--Italy--Romagna--History--19th century.
Architecture--Italy--Romagna--History--20th century.
Art nouveau (Architecture)--Italy--Romagna.
Decoration and ornament, Architectural--Italy--Romagna.
Decoration and ornament--Art nouveau
Princeton subject headings:
Architecture--Italy--Romagna--19th century.
Architecture--Italy--Romagna--20th century.
Art nouveau (Architecture)--Italy--Romagna.