
The Monongahela River corridor south of Pittsburgh shows a landscape defined by heavy industrial footprints and postwar suburban expansion at the start of the 1960s. High-density residential zones in Brentwood and Whitehall transition into the industrial valley of Clairton and Glassport, where Slag Pits and a large Slag Dump near the Allegheny County Airport testify to the region's steel-making legacy. The interior of Jefferson township remains more varied, with active quarries and strip mines located near landmarks like the U S Bureau of Mines Experimental Sta. Researchers can trace the complex rail network of the Pennsylvania Railroad and the Baltimore and Ohio Railroad as they navigate the sharp topography between Peters Creek and Lick Run. Family history is anchored by numerous local landmarks including Cochrans Mill, Zion Cem, and James Chapel.
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