
The Blue River carves a winding path through the borderlands of Harrison and Crawford Counties, defining the sharp topography of this 1962 survey. Much of the southern landscape is occupied by the Harrison-Crawford State Forest, where steep ridges like Shafer Ridge and isolated peaks such as Pilot Knob overlook the watershed. The settlement of Milltown sits at a prominent bend in the river, while Marengo occupies the northwest corner, connected by the Southern rail line. The map captures a rural network of ridge-top churches and family-named landmarks, including Goodman Ridge Ch and Thompson Chapel. Significant industrial activity is evidenced by a large Quarry and associated Tailings near the river, reflecting the local limestone economy. Numerous small waterways, including the curiously named Whiskey Run, Cider Fork, and Brandywine Fork, drain the upland forest into the main river channel.
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