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(also titled Facts about Michigan, mostly concerning its geology, natural history and resources)
Visual materials
The bulk of the Visual materials series (Box 23) is made up of illustrations from Winchell's books. Also included are a collection of fossil sketches by C. P. Whitfield, sketches by N. H. Winchell from the Michigan Geological Survey, plans for Winchell's house, portraits of Winchell, and miscellaneous scientific drawings.