Ninth Street Bridge, from below deck of Seventh Street Bridge. Three Sisters Bridges, Ninth Street Bridge, Spanning Allegheny River at Ninth Street, Pittsburgh, Allegheny County, PA Covell, Vernon R Nutter, A D Roush, Stanley L Wilkerson, T J American Bridge Company Foundation Company Allegheny County Department of Public Works Brown, Norman F Richardson, George S DeLony, Eric N, project manager Pennsylvania Department of Transportation, sponsor Pennsylvania Historical and Museum Commission, sponsor Lowe, Jet, photographer

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