[new_time]

Ida Tarbell's father was an oilman who was ruined by Rockefeller and Standard Oil while she was a girl, which is important to keep in mind when contextualizing her work. She lived her life in part as a crusade against Standard Oil and Rockefeller. Obviously she was heavily biased, this being instilled in her early on.

For a less biased look at the history of the American oil industry by way of Rockefeller and Standard Oil, I strongly recommend Titan by Ron Chernow - author of Hamilton - which is an excellent account of Rockefeller and Standard Oil, both the good and the bad.