The New International Encyclopædia…
“ The forests to the north and the iron-mines of the Lake Superior region together afford the raw products for a large number of important industries. The manufactures of iron are only possible where an abundant supply of fuel is attainable, and the extensive coal-mining industry of the State abundantly meets this requirement. Only two States exceed Illinois in the manufacture of iron and steel. Chicago is the largest producer of these products among all the lake cities. ”
