Columbia subject headings:
Capitalists and financiers--United States.
Industries--United States--History.
Railroads--United States--History.
Harvard subject headings:
Capitalists and financiers--United States
Industries--United States--History
Railroads--United States--History
Princeton subject headings:
Capitalists and financiers--United States.
Industries--United States--History.
Railroads--United States--History.