![U.S. Steel National Tube Works, Central Boiler House, Along Monongahela River, McKeesport, Allegheny County, PA - PICRYL - Public Domain Media Search Engine Public Domain Search U.S. Steel National Tube Works, Central Boiler House, Along Monongahela River, McKeesport, Allegheny County, PA - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn4.picryl.com/photo/2019/09/19/us-steel-national-tube-works-central-boiler-house-along-monongahela-river-mckeesport-8d734c-1024.jpg)
U.S. Steel National Tube Works, Central Boiler House, Along Monongahela River, McKeesport, Allegheny County, PA - PICRYL - Public Domain Media Search Engine Public Domain Search
![U.S. Steel National Tube Works, Skelp Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA | Library of Congress U.S. Steel National Tube Works, Skelp Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA | Library of Congress](http://tile.loc.gov/storage-services/service/pnp/habshaer/pa/pa3300/pa3347/photos/359416pv.jpg)
U.S. Steel National Tube Works, Skelp Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA | Library of Congress
![U.S. Steel National Tube Works, Main Pipe Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA | Library of Congress U.S. Steel National Tube Works, Main Pipe Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA | Library of Congress](http://tile.loc.gov/storage-services/service/pnp/habshaer/pa/pa3300/pa3346/photos/359384pv.jpg)
U.S. Steel National Tube Works, Main Pipe Mill Building, Along Monongahela River, McKeesport, Allegheny County, PA | Library of Congress
![File:McKeesport plant of the National Tube Company where “Steel Preferred” was filmed. Walter Long and William Boyd in the foreground.jpg - Wikimedia Commons File:McKeesport plant of the National Tube Company where “Steel Preferred” was filmed. Walter Long and William Boyd in the foreground.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/a/a6/McKeesport_plant_of_the_National_Tube_Company_where_%E2%80%9CSteel_Preferred%E2%80%9D_was_filmed._Walter_Long_and_William_Boyd_in_the_foreground.jpg)