Columbia subject headings:
Harvard subject headings:
City planning--Germany--Cologne--Citizen participation--History--20th century.
City planning--Germany--Cologne--History--20th century.
City planning--Pennsylvania--Philadelphia--Citizen participation--History--20th century.
City planning--Pennsylvania--Philadelphia--History--20th century.
Protest movements--Germany--Cologne--History--20th century.
Protest movements--Pennsylvania--Philadelphia--History--20th century.
Urban renewal--Germany--Cologne--History--20th century.
Urban renewal--Pennsylvania--Philadelphia--History--20th century.
Princeton subject headings:
City planning--Germany--Cologne--Citizen participation--History--20th century.
City planning--Germany--Cologne--History--20th century.
City planning--Pennsylvania--Philadelphia--Citizen participation--History--20th century.
City planning--Pennsylvania--Philadelphia--History--20th century.
Protest movements--Germany--Cologne--History--20th century.
Protest movements--Pennsylvania--Philadelphia--History--20th century.
Urban renewal--Germany--Cologne--History--20th century.
Urban renewal--Pennsylvania--Philadelphia--History--20th century.