Industrial history and rural settlement patterns converge along the winding banks of Mahoning Cr and Redbank Cr. This area of Armstrong County is defined by its early iron industry heritage, evidenced by locations such as Mahoning Furnace and McCrea Furnace. These sites, along with the proximity of Cannel Mine Rd, point to a landscape once deeply integrated into Pennsylvania's extractive and manufacturing economy.
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1901 · Rural Valley
USGS Topo · 1:62,500
1903 · Rural Valley
USGS Topo · 1:62,500
1906 · Clarion
USGS Topo · 1:62,500
1907 · Clarion
USGS Topo · 1:62,500
1909 · Smicksburg
USGS Topo · 1:62,500
1924 · Brookville
USGS Topo · 1:62,500
1926 · Brookville
USGS Topo · 1:62,500
1938 · Smicksburg
USGS Topo · 1:62,500
1939 · Smicksburg
USGS Topo · 1:62,500
1944 · Brookville
USGS Topo · 1:62,500