University of Nebraska
U of Nebraska: Railroads and Making of Modern America: Representing the Railroad
A primary source collection of artworks, photographs, and illustrations of the railroads in the 19th century that represent different perspectives.
OpenStax
Open Stax: Industrialization 1870 1900: From Invention to Industrial Growth
This section of the textbook describes how new inventions spurred industrial growth in the 19th century and discusses the business methods and models of Andrew Carnegie, John Rockefeller, and J. P. Morgan.