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Steelmaking in the basic oxygen shop at Edgar Thomson Plant -   North Braddock, Pennsylvania

Steelmaking in the basic oxygen shop at Edgar Thomson Plant - North Braddock, Pennsylvania

A dynamic image of the inside of Duquesne Steel and a worker tapping iron from a blast furnace.

A dynamic image of the inside of Duquesne Steel and a worker tapping iron from a blast furnace.

I can't believe the fronts are open like that.

The Monongahela Incline, built in 1870 and still in use today, remains the steepest incline in the world. The adjacent Monongahela Freight Incline was in operation for 51 years, from 1884 to 1935

Inside view of the Fort Pitt Tunnel during construction in Pittsburgh in 1958.

Inside view of the Fort Pitt Tunnel during construction in Pittsburgh in

J & L steel works on the south side ABLAZE with light!!! photo 1946....click through for more GREAT "pittsburgh by night" black and white pics!!! The Digs: Pittsburgh Post-Gazette.......

J & L steel works on the south side ABLAZE with light! photo through for more GREAT "pittsburgh by night" black and white pics! The Digs: Pittsburgh Post-Gazette.

Detroit: Pouring molten iron into open hearth furnaces, Great Lakes Steel Corp., Ecorse, Oct. 10, 1930. Photograph by Graphic Arts Studios

Detroit: Pouring molten iron into open hearth furnaces, Great Lakes Steel Corp. Photograph by Graphic Arts Studios

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