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American appearance arch architects architectural beams bearing bracing brick bridge builders building built cables cantilever carried Central century Chicago chief chord City Civil colonies columns Company completed compression concrete connections construction continuous covered crossing curve deck depth designed developed diagonals dome early elements engineer entirely erected established example extending face feet floor followed forces frame girders heavy height horizontal increased interior invented iron known largest later length load masonry material maximum Ohio original patented Pennsylvania Philadelphia posts purlins rail Railroad reached reinforced rested result ribs rigid River roof shed side slab space span station steel stone Street stresses structure supported surface suspension techniques tension terminal timber tion tower track traffic trains truss Twentieth Century United vaults vertical walls wind York
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