Columbia subject headings:
Businessmen--United States--Biography.
Petroleum industry and trade--United States.
Rockefeller, John D. (John Davison), 1839-1937.
Harvard subject headings:
Businessmen--United States--Biography
Businesspeople--United States--Biography.
Petroleum industry and trade--United States
Rockefeller, John D. (John Davison), 1839-1937.
Princeton subject headings:
Businessmen--United States--Biography.
Petroleum industry and trade--United States.
Rockefeller, John D. (John Davison), 1839-1937.