Columbia subject headings:
City planning--Portugal--Porto--History--19th century.
City planning--Portugal--Porto--History--20th century.
Urbanization--Portugal--Porto--History--19th century.
Urbanization--Portugal--Porto--History--20th century.
Harvard subject headings:
City planning--Portugal--Porto--History--19th century.
City planning--Portugal--Porto--History--20th century.
Urbanization--Portugal--Porto--History--19th century.
Urbanization--Portugal--Porto--History--20th century.
Princeton subject headings:
City planning--Portugal--Porto--History--19th century.
City planning--Portugal--Porto--History--20th century.
Urbanization--Portugal--Porto--History--19th century.
Urbanization--Portugal--Porto--History--20th century.