
Harrisburg sits at the heart of this mid-century Pennsylvania corridor, where the Susquehanna River cuts through the ridges of the Appalachian Mountains. The landscape is defined by the sharp parallel lines of the Allegheny Mountains, including Peters Mountain and Blue Mountain, which separate fertile valleys from dense woodlands like the Bald Eagle State Forest. This era shows a heavily industrialized and militarized region, anchored by the massive Indiantown Gap Military Reservation and logistics hubs like the Naval Supply Depot and Letterkenny Ordnance Depot.
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1889 · Catawissa
USGS Topo · 1:62,500
1889 · Hazleton
USGS Topo · 1:62,500
1889 · Pottsville
USGS Topo · 1:62,500
1891 · Wilkesbarre
USGS Topo · 1:62,500
1891 · Hazleton
USGS Topo · 1:62,500
1891 · Pottsville
USGS Topo · 1:62,500
1891 · Lebanon
USGS Topo · 1:62,500
1892 · Catawissa
USGS Topo · 1:62,500
1892 · Lykens
USGS Topo · 1:62,500
1892 · Hummelstown
USGS Topo · 1:62,500