A bird's eye view of Pittsburgh, Pennsylvania, in a 1902 lithograph by Thaddeus Mortimer Fowler. At this point in its history, Pittsburgh was an industrial and commercial powerhouse, with extensive railroad connections to the rest of the United States. Together with the rest of Allegheny County, it produced massive amounts of steel and steel products: by 1911 they reached 24% of the national output of pig iron, 34% of Bessemer steel, 44% of open hearth steel, 53% of crucible steel, 24% of steel rail, and 59% of structural shape.Lithograph: Thaddeus Mortimer Fowler; restoration: Adam Cuerden
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