Mrs. Vincenzo Botta, Appletons' Cyclopædia of American Biography (1900)
“ Carnegie was subsequently associated with others in establishing a rolling-mill, and from this has grown the most extensive and complete system of iron and steel industries ever controlled by an individual, embracing the Edgar Thomson steel works, the Pittsburgh Bessemer steel works, the Lucy furnaces, the Union iron mills, the Union mill (Wilson, Walker & Co.) ”
