Historic Shape References American Institute of Steel h beams iron used for construction steel
pages are from the tenth edition of "Steel in Construction" (A. & P. Roberts Company, 1898) Pencoyd Iron Works, A. & P. Roberts Company 1898 Steel in Construction-Convenient Rules, Formulae and Tables for the Strength of Steel Shapes Used as Beams, Struts, Shafts, etc. Tenth Pencoyd Iron Works, A. & P. Roberts Company
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