"598.6272" . . . . . . "18.288" . . . . . "1928-05-30" . . . . . . . . . . . . "Silver Bridge" . . . "1928" . . . . . . . . . . "Silver Bridge#Wreckage analysis" . . . . . . . "274.32" . . . . . . . . . . . . . "Silver Bridge#Silver Memorial Bridge" . . . . . "2" . "silver bridge" . . . . . "Silver Bridge" . . . "Silver Memorial Bridge" . . . . . . "1969" . . . . . "681.228" . . . . . . . . . . . . . . . . . . . . . . . "213.36" . . "1969-12-15" . . "4 lanes of" . . "1967-12-15" . . . "Silver Bridge Collapse - Creation of National Inspection Standards" . .