Smithsonian Institution
National Museum of American History: Powering the Past: Emergence of Electrical Utilities in America
Looks at the history of electrical utilities in the United States from the time of Edison up to President Franklin Roosevelt.
Digital History
Digital History: Business Organizations [Pdf]
After a brief description of various ways that businesses are organized, find out about the monopolies formed in the age of big business in the late 19th century, focusing primarily on Standard Oil. [pdf]