Columbia subject headings:
City planning--Italy--Ravenna.
Industrial buildings--Remodeling for other use--Italy--Ravenna.
Industrial sites--Italy--Ravenna.
Urban renewal--Italy--Ravenna.
Harvard subject headings:
City planning--Italy--Ravenna.
Industrial buildings--Remodeling for other use--Italy--Ravenna.
Industrial sites--Italy--Ravenna.
Urban renewal--Italy--Ravenna.
Princeton subject headings: