Houses and steel mills in Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278005/photo-image-sky-smoke-public-domainFree Image from public domain licenseWashington, D.C. -Hugh and Lynn Massman sightseeing on their first day in Washington. Their baby is being taken care of in… https://www.rawpixel.com/image/12295521/photo-image-plant-person-skyFree Image from public domain licenseNew York, New York. Saint Mark's Place and the Bowery at midnight. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288534/photo-image-person-smoke-roadFree Image from public domain licenseGoing to mass. Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283209/photo-image-person-smoke-lightFree Image from public domain license[Untitled photo, possibly related to: Going home from work at the steel mill in Midland, Pennsylvania]. Sourced from the… https://www.rawpixel.com/image/12277809/photo-image-person-smoke-roadFree Image from public domain license[Untitled photo, possibly related to: Slag heaps at Nanty Glo, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12256433/photo-image-plant-person-skyFree Image from public domain licenseWashington, D.C. A street scene, probably 14th Street, showing automobile and street car traffic. The People's Life… https://www.rawpixel.com/image/12260344/photo-image-background-person-skyFree Image from public domain licenseDubuque, Iowa. Smoke from sash and door mills. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282851/photo-image-person-sky-smokeFree Image from public domain licenseDust storm. Note heavy metal signs blown out by wind. Amarillo, Texas. Sourced from the Library of Congress. https://www.rawpixel.com/image/12251087/image-cloud-person-skyFree Image from public domain licenseChicago, Illinois. An unusually heavy fog in the early afternoon. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288505/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Sunday morning. Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283513/photo-image-person-smoke-lightFree Image from public domain licenseNew York, New York. Grumman Wildcat airplane exhibited at Columbus Circle for bond selling purposes. Sourced from the… https://www.rawpixel.com/image/12289900/photo-image-people-smoke-airplaneFree Image from public domain licenseNew York, New York. Former Dodge building at 56th Street and Broadway, in the automobile district. Sourced from the Library… https://www.rawpixel.com/image/12288798/photo-image-person-sky-smokeFree Image from public domain license