The Delaware River serves as a central artery for this borderland where Pennsylvania and New Jersey meet, framed by a series of prominent peaks and ridges. The industrial legacy of the region is anchored by Durham Furnace and nearby Mine Hill, reflecting the historical mineral wealth of the valley. Settlement patterns are concentrated in riverfront towns like Riegelsville and Raubsville, while smaller hamlets such as Durham and Kintnersville dot the interior. Genealogical value is high throughout the quadrangle, with several established burial sites including the Union / Riegelsville Union Cem and the Gallows Hill Graveyard. The topography is defined by significant elevations like Musconetcong Mtn and Hexenkopf Hill, while the Musconetcong River joins the Delaware from the east near Finesville, marking the boundary between Warren and Hunterdon counties.
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1888 · Quakertown
USGS Topo · 1:62,500
1890 · Easton
USGS Topo · 1:62,500
1890 · Doylestown
USGS Topo · 1:62,500
1890 · Quakertown
USGS Topo · 1:62,500
1891 · Easton
USGS Topo · 1:62,500
1891 · Doylestown
USGS Topo · 1:62,500
1894 · Allentown
USGS Topo · 1:62,500
1894 · Quakertown
USGS Topo · 1:62,500
1932 · Easton
USGS Topo · 1:62,500
1939 · Allentown
USGS Topo · 1:62,500