[Untitled photo, possibly related to: Prefabricated steel farmhouse, Greenbelt, Maryland]. Sourced from the Library of… https://www.rawpixel.com/image/12253047/photo-image-plant-sky-treeFree Image from public domain licenseSteel mill. Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12272199/photo-image-person-smoke-public-domainFree Image from public domain licenseColumbia Steel Company at Geneva, Utah. Partly finished open hearth furnaces and stacks for a steel mill under construction… https://www.rawpixel.com/image/12297922/photo-image-cloud-person-skyFree Image from public domain license[Untitled photo, possibly related to: Scene in west Aliquippa, Pennsylvania. Stacks of the Jones and Laughlin Steel… https://www.rawpixel.com/image/12278757/photo-image-background-person-skyFree Image from public domain license[Untitled photo, possibly related to: The Bessemers "blooming" at the Jones and Laughlin Steel Company in Aliquippa… https://www.rawpixel.com/image/12262781/photo-image-sky-smoke-lightFree Image from public domain license