
The Lehigh River snakes through the northeast corner of this Pennsylvania landscape, carving a valley past industrial and transport hubs like Slatington and Walnutport. The terrain is defined by the sharp rise of Blue Mountain to the north and the rolling agricultural uplands of Heidelberg and Lowhill townships. This mid-century survey captures a region in transition, where established rural communities such as Saegersville and Germansville maintain their 19th-century footprints alongside large conservation tracts like the Trexler Private Game Preserve and State Game Lands No 205.
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1888 · Quakertown
USGS Topo · 1:62,500
1889 · Hazleton
USGS Topo · 1:62,500
1890 · Quakertown
USGS Topo · 1:62,500
1891 · Hazleton
USGS Topo · 1:62,500
1893 · Hazleton
USGS Topo · 1:62,500
1894 · Reading
USGS Topo · 1:62,500
1894 · Allentown
USGS Topo · 1:62,500
1894 · Quakertown
USGS Topo · 1:62,500
1902 · Boyertown
USGS Topo · 1:62,500
1902 · Slatington
USGS Topo · 1:62,500