National Geographic : 1947 Apr
Steel: Master of Them All 417 Gabriel Moulin from Redwood Empire Association Steel Leaps San Francisco's Golden Gate in Three Spans; Only Steel Could Do It Compare steel's airy cobweb, which carries some 18,000 vehicles a day, with stone's massive arches bearing a trickle of traffic. Into this 9,266-foot bridge (including approaches) went 108,000 tons of steel, enough to load 30 miles of freight cars end to end. Twin towers rise as high as 63-story buildings. Bethlehem Steel built it.