Columbia subject headings:
Architecture--Italy--Romagna--History--20th century.
Seaside architecture--Italy--Romagna--History--20th century.
Tourism and city planning--Italy--Romagna--History--20th century.
Harvard subject headings:
Architecture--Italy--Romagna--History--20th century.
Seaside architecture--Italy--Romagna--History--20th century.
Tourism and city planning--Italy--Romagna--History--20th century.
Princeton subject headings:
Architecture--Italy--Romagna--History--20th century.
Seaside architecture--Italy--Romagna--History--20th century.
Tourism and city planning--Italy--Romagna--History--20th century.