See J. Borchert and D. P. Yeager, ed., Atlas of Minnesota (1969); C. C. Chrislock, The Progressive Era in Minnesota, 1899–1918 (1971); T. C. Blegen, Minnesota: A History of the State (2d ed. 1975); D. J. Tweton, Depression: Minnesota in the Thirties (1981); J. D. Holmquist, They Chose Minnesota (1988).
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