Columbia subject headings:
Iron industry and trade--United States.
Merritt, Alfred, 1848-1926.
Merritt, Leonidas, 1844-1926.
Rockefeller, John D. (John Davison), 1839-1937.
Harvard subject headings:
Iron industry and trade--United States
Merritt, Alfred, 1848-1926.
Merritt, Leonidas, 1844-1926.
Rockefeller, John D. (John Davison), 1839-1937.
Princeton subject headings:
Iron industry and trade--United States.
Merritt, Alfred, 1848-1926.
Merritt, Leonidas, 1844-1926.
Rockefeller, John D. (John Davison), 1839-1937.