See J. A. Door, Jr., and D. F. Eschman, Geology of Michigan (1970); A. R. Gilpin, Territory of Michigan, 1805–1887 (1971); R. A. Santer, Michigan: Heart of the Great Lakes (1977); L. M. Sommers, ed., Atlas of Michigan (1977) and et al., Michigan: A Geography (1984). B. Blenz, The Encyclopedia of Michigan (1981); B. Rubenstein and L. Ziewacz, Michigan (1981).

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