
Industrial Northwest Indiana takes center stage in this late-1960s survey, showing the complex web of steel-belt infrastructure connecting Hammond, East Chicago, and Gary. The landscape is dominated by heavy transit corridors like the Toll Road and Tri-State Highway, alongside a dense rail network including the Conrail and Norfolk And Western. Despite this modernization, natural conservation remains visible at the Indiana Dunes National Lakeshore and the Hoosier Prairie State Nature Preserve in the southern portion of the quadrangle.
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