The Delaware River forms a natural border through this landscape, separating New Jersey settlements like Frenchtown and Milford from their Pennsylvania counterparts. The river valley is defined by significant historical infrastructure, notably the Uhlerstown Covered Bridge and the Erwinna Covered Bridge, which serve as tangible links to the region's 19th-century transit patterns. This survey reveals a high density of small-scale aviation, with five distinct landing strips including Alexandria Airport and Erkes Airport dotting the countryside.
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1890 · Easton
USGS Topo · 1:62,500
1890 · High Bridge
USGS Topo · 1:62,500
1890 · Lambertville
USGS Topo · 1:62,500
1890 · Doylestown
USGS Topo · 1:62,500
1891 · Easton
USGS Topo · 1:62,500
1891 · Lambertville
USGS Topo · 1:62,500
1891 · Doylestown
USGS Topo · 1:62,500
1894 · Lambertville
USGS Topo · 1:62,500
1898 · High Bridge
USGS Topo · 1:62,500
1900 · Raritan
USGS Topo · 1:125,000