Cincinnati (vicinity), Ohio. Landscape as seen from the towboat Ernest T. Weir going down the Ohio River. Sourced from the… https://www.rawpixel.com/image/12295266/photo-image-plant-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Unloading garbage at city dump. Dubuque, Iowa]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282899/photo-image-cloud-person-skyFree Image from public domain licensePittsburgh waterfront. Monongahela and Allegheny Rivers, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12268546/photo-image-public-domain-factory-architectureFree Image from public domain licenseFlour mills along the river. Minneapolis, Minnesota. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282312/photo-image-plant-sky-treeFree Image from public domain licenseTailing pit of active gold mine in the valley of the Animas River, San Juan County, Colorado. Ranchers and farmers who want… https://www.rawpixel.com/image/12149098/image-plant-art-vintageFree Image from public domain licensePittsburgh waterfront. Monongahela and Allegheny Rivers, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12267765/photo-image-sky-smoke-public-domainFree Image from public domain licenseSan Sebastian, Puerto Rico (vicinity). Children playing in a contaminated river. Sourced from the Library of Congress. https://www.rawpixel.com/image/12281916/photo-image-person-public-domain-childrenFree Image from public domain licenseIndustrial Construction Engineer Pollution https://www.rawpixel.com/image/90990/free-photo-image-factory-business-chemicalView license[Untitled photo, possibly related to: Jones Laughlin steel company, on both sides of the river. Pittsburgh, Pennsylvania].… https://www.rawpixel.com/image/12287304/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284356/photo-image-sky-smoke-public-domainFree Image from public domain licenseOswego, New York. Sunday fishermen on the Oewego River opposite the bauxite docks. Sourced from the Library of Congress. https://www.rawpixel.com/image/12296107/photo-image-person-sky-smokeFree Image from public domain licenseSteel plant on Monongahela River. Clairton, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12272271/photo-image-plant-sky-smokeFree Image from public domain license