
The Illinois River corridor serves as the industrial and natural anchor of this region, winding through a landscape transitioning from the dense urban expansion of western Chicago to the fertile prairie of north-central Illinois. In the east, the rapid growth of Aurora and Naperville is evident as suburban development pushes toward the Du Page River. This 1974 revision, based on surveys dating back to 1916, documents the post-war industrial footprint, most notably the Joliet Arsenal and the concentration of river-side industry in Peru and Ottawa.
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