http://www.gensteel.com/steel_buildings_types.htm

http://en.wikipedia.org/wiki/Stainless_steel

http://www.steelbuildings.org/Building_Descriptions.html

http://www.wlfuller.com/html/steel_types.html

http://research.the-bac.edu/virtual/steel/steel.html

http://www.wikipediaondvd.com/nav/art/g/9.html

http://www.steelbuilding.com/buildings/frame_types.htm

http://www.steel-pipes.net/steel-pipes-by-types.html

http://www.reliantmarkingtools.co.uk/steel_type.htm

http://www.timken.com/en-us/products/Steel/productlist/types/Pages/default.aspx