[Untitled photo, possibly related to: The Bessemers "blooming" at the Jones and Laughlin Steel Company in Aliquippa… https://www.rawpixel.com/image/12239762/photo-image-sky-smoke-lightFree Image from public domain licenseOil industry background https://www.rawpixel.com/image/11544746/oil-industry-backgroundView licenseOil platform background https://www.rawpixel.com/image/11513418/oil-platform-backgroundView licenseAir pollution background https://www.rawpixel.com/image/11512379/air-pollution-backgroundView licenseAir pollution background https://www.rawpixel.com/image/11509716/air-pollution-backgroundView licenseAir pollution background, white smoke https://www.rawpixel.com/image/11934223/air-pollution-background-white-smokeView licenseAir pollution background https://www.rawpixel.com/image/11555269/air-pollution-backgroundView license[Untitled photo, possibly related to: Parochial school children playing in front of church, before the school bell, Dubuque… https://www.rawpixel.com/image/12311671/image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Old Ben No. 8 Mine, West Frankfort, Illinois (see 26940-D)]. Sourced from the Library… https://www.rawpixel.com/image/12314133/image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Stream pollution, Dubuque, Iowa]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12311512/image-plant-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/12318209/image-sky-smoke-lightFree Image from public domain license[Untitled photo, possibly related to: Sash and door mill, Dubuque, Iowa]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12312117/image-cloud-sky-smokeFree Image from public domain licenseCoal barges on Monongahela River, Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12315221/image-cloud-person-skyFree Image from public domain licenseBoys playing with bows and arrows near railroad yards, Dubuque, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12311749/image-arrows-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/12262779/photo-image-sky-smoke-technologyFree Image from public domain licenseAir pollution background https://www.rawpixel.com/image/11560051/air-pollution-backgroundView 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[Untitled photo, possibly related to: The Bessemers "blooming" at the Jones and Laughlin Steel Company in Aliquippa… https://www.rawpixel.com/image/12262600/photo-image-fire-sky-smokeFree Image from public domain license