00602pamaa2200157 4500 0000041602 20070315090000.0 070309 eng Nil TA684 BRI 1970 BRITISH Standards Institution Specification for the use of structural steel in building : part 1. imperial units : part 1. imperial units : BS 449 : Part 1 : 1970 British Standards Institution. London: British Standards Institution, 1970. 117p.: ill.; 21 cm. Building, Iron and steel Steel, Structural