
The Susquehanna River dominates this landscape, serving as the broad dividing line between the growing boroughs of Middletown, Mount Joy, and Marietta. In the mid-1950s, the river is dotted with significant landforms like Threemile Island and Shelley Island, while the industrial and military presence at Olmsted AFB marks the northwestern edge. The era's transportation network is clearly defined by the Pennsylvania Turnpike cutting across the northern reaches and the established routes of the Pennsylvania and Reading railroads supporting local commerce.
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