Columbia subject headings:
Business enterprises--United States--History.
Capitalists and financiers--United States--History.
Entrepreneurship--History.
Industries--United States--History.
Harvard subject headings:
Business enterprises--United States--History
Capitalists and financiers--United States--History.
Entrepreneurship--History
Industries--United States--History
Princeton subject headings:
Business enterprises--United States--History.
Capitalists and financiers--United States--History.
Entrepreneurship--History.
Industries--United States--History.