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Ida Tarbell not only interviewed Standard Oil executives, oil industry workers, and public officials but also examined thousands of pages of the company's internal communications.
Ida Tarbell, who investigated the Standard Oil Company, was a muckraker (a journalist who sought to expose corruption in US institutions during the Progressive Era, 1897-1920).
As part of her investigation of the Standard Oil Company, muckraker Ida Tarbell conducted interviews.
Published in 1904, muckraker Ida Tarbell's book _The History of the Standard Oil Company_ exposed the company's unfair business practices.