
The Delaware River carves a deep valley between Pennsylvania and New Jersey on this 1930s survey, serving as a corridor for heavy industry and transportation. The landscape is defined by the ridge-and-valley system of the Appalachians, with Marble Mountain and Scotts Mountain rising above the riverbanks. Industrial heritage is evident at Durham Furnace and near the Lehigh River confluence, where a dense network of railroads including the Lehigh Valley Railroad and Pennsylvania Railroad navigate the narrow corridors.
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