Harriet Martineau’s Autobiography, ed. Maria Weston Chapman (Boston: James R. Osgood & Co., 1877). 2 vols. http://oll.libertyfund.org/titles/2010,
Thinking she was close to death Martineau wrote her autobiography in 1855 but lived for another 20 years. She recounts her activities in various mid-19th century reform movements, her struggle to become a professional writer, and her work in popularizing the ideas of free market political economy.
The text is in the public domain.