The Monongahela River carves a deep industrial and residential corridor through this portion of Allegheny County, anchoring a dense network of boroughs and settlements. The riverfront is defined by the legacy of steel and transport, with Glassport, Clairton, and Elizabeth lining the eastern and western banks. Inland, the landscape transitions from the aviation infrastructure of the Allegheny County Airport near Lincoln Place to the suburban developments of Pleasant Hills.
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1901 · Amity
USGS Topo · 1:62,500
1902 · Brownsville
USGS Topo · 1:62,500
1904 · Amity
USGS Topo · 1:62,500
1904 · Mc Keesport
USGS Topo · 1:62,500
1904 · Carnegie
USGS Topo · 1:62,500
1906 · Brownsville
USGS Topo · 1:62,500
1906 · Carnegie
USGS Topo · 1:62,500
1907 · Pittsburg
USGS Topo · 1:62,500
1908 · Carnegie
USGS Topo · 1:62,500
1931 · Brownsville
USGS Topo · 1:62,500