http://www.iss-steel.com/

http://www.saginawpipe.com/

http://www.engineersedge.com/standard_material/Steel_ibeam_properties_2.htm

http://www.tmtco.com/products/beam.html

http://en.wikipedia.org/wiki/I-beam

http://www.pipebends.com/bend.html

http://www.thefabricator.com/Sawing/Sawing_Article.cfm?ID=188

http://www.alliancesteelonline.com/products.htm

http://www.brown-strauss.com/

http://www.thomasnet.com/products/structural-beams-3634607-1.html