Columbia subject headings:
Cities and towns--Growth.
Cultural property--Protection.
Historic buildings--Conservation and restoration.
Historic districts--Romania--Sibiu--Exhibitions.
Historic districts--Syria--Aleppo--Exhibitions.
Historic districts--Yemen (Republic)--Shibām--Exhibitions.
Historic sites--Conservation and restoration.
Sustainable development.
Urban renewal--Romania--Sibiu--Exhibitions.
Urban renewal--Syria--Aleppo--Exhibitions.
Urban renewal--Yemen (Republic)--Shibām--Exhibitions.
Harvard subject headings:
Historic districts--Romania--Sibiu--Exhibitions.
Historic districts--Syria--Aleppo--Exhibitions.
Historic districts--Yemen--Shibām--Exhibitions.
Urban renewal--Romania--Sibiu--Exhibitions.
Urban renewal--Syria--Aleppo--Exhibitions.
Urban renewal--Yemen--Shibām--Exhibitions.
Princeton subject headings: