Columbia subject headings:
Automobile industry and trade--United States--History--20th century.
Interstate Highway System.
Local transit--United States--History--20th century.
Roads--Government policy--United States--History--20th century.
Transportation, Automotive--United States--History--20th century.
Harvard subject headings:
Automobile industry and trade--United States--History--20th century.
Interstate Highway System.
Local transit--United States--History--20th century.
Roads--Government policy--United States--History--20th century.
Transportation, Automotive--United States--History--20th century.
Princeton subject headings:
Automobile industry and trade--United States--History--20th century.
Interstate Highway System.
Local transit--United States--History--20th century.
Roads--Government policy--United States--History--20th century.
Transportation, Automotive--United States--History--20th century.