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In page L. Frank Baum:

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Baum's description of Kansas in The Wonderful Wizard of Oz is based on his experiences in drought-ridden South Dakota.[7] During much of this time, his mother-in-law was living in the Baum household. While Baum was in South Dakota, he sang in a quartet which included James Kyle, who became one of the first Populist (People's Party) senators in the U.S.[citation needed]