Columbia subject headings:
Infrastructure (Economics)--Europe--History--Case studies.
Infrastructure (Economics)--United States--History--Case studies.
Technological innovations--Economic aspects--Europe--History--Case studies.
Technological innovations--Economic aspects--United States--History--Case studies.
Urban policy--Europe--History--Case studies.
Urban policy--United States--History--Case studies.
Harvard subject headings:
Infrastructure (Economics)--Europe--History--Case studies.
Infrastructure (Economics)--United States--History--Case studies.
Technological innovations--Economic aspects--Europe--History--Case studies.
Technological innovations--Economic aspects--United States--History--Case studies.
Urban policy--Europe--History--Case studies.
Urban policy--United States--History--Case studies.
Princeton subject headings:
Infrastructure (Economics)--Europe--History--Case studies.
Infrastructure (Economics)--United States--History--Case studies.
Technological innovations--Economic aspects--Europe--History--Case studies.
Technological innovations--Economic aspects--United States--History--Case studies.
Urban policy--Europe--History--Case studies.
Urban policy--United States--History--Case studies.