Relevant Web Sites
A Span for All Seasons: Pittsburgh Eyebar Suspension Bridges
Bridges & Tunnels of Allegheny County, PA: Sixth Street Bridge
HAER: Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA
HAER: Three Sisters Bridges, Spanning Allegheny River at 6th, 7th & 9th Sts., Pittsburgh, Allegheny County, PA
Wikipedia: Roberto Clemente Bridge
There is no relevant literature listed in the database.