12.5" x 15.5" steel engraved map with original expert hand water color in support showing differentiation of counties and voting districts . Fine crisp and clean condition. from a library de-accessioned archive . Excellent insert map of Chicago 10 years before its devastating fire of 1871 and the digging of a canal , effectively changing of the course of a river to resolve local sanitation issues. This is a very dirty and dangerous Chicago in 1860 with the herding of cattle straight into downtown for slaughter