Bridges 14 Design and construction 4 Bridges--Philadelphia, PA--19th century 3 History 3 Tunnels 3 %CHR 1 1813 1 more ... Bridge approaches 1 Bridge building--19th century 1 Bridges, Wooden 1 Buildings 1 City planning 1 Communication and traffic 1 Electric railroads 1 Highway law 1 Pickets 1 Schuylkill River (Pa.) 1 Schuylkill River Views--Late 19th century 1 Suicide victims 1 Toll bridges 1 Traffic congestion 1 Wooden bridges 1 less ...