Blue Mountain anchors the northern boundary of this central Pennsylvania landscape, where the Appalachian National Scenic Trail traces the high ridge along the Lebanon and Schuylkill county lines. Below the mountain, the terrain transitions into the Monroe Valley, a corridor defined by Monroe Creek and a network of rural lanes. The settlement pattern is concentrated along the east-west corridor of Interstate 78 and Route 22, connecting established communities like Fredericksburg and Jonestown.
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1891 · Lebanon
USGS Topo · 1:62,500
1892 · Lykens
USGS Topo · 1:62,500
1892 · Hummelstown
USGS Topo · 1:62,500
1892 · Pine Grove
USGS Topo · 1:62,500
1893 · Lykens
USGS Topo · 1:62,500
1893 · Lebanon
USGS Topo · 1:62,500
1899 · Lebanon
USGS Topo · 1:62,500
1924 · Hummelstown
USGS Topo · 1:62,500
1943 · Lebanon
USGS Topo · 1:62,500
1943 · Lykens
USGS Topo · 1:62,500