In the mill district of Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277844/photo-image-plant-person-skyFree Image from public domain licenseLoading cars with giant power shovel at Danube iron mine near Bovey, Minnesota. Sourced from the Library of Congress. https://www.rawpixel.com/image/12286337/photo-image-person-sky-smokeFree Image from public domain licenseAir pollution background https://www.rawpixel.com/image/11560051/air-pollution-backgroundView license[Untitled photo, possibly related to: World's largest open pit mine, Hull Rust Mahoning. Near Hibbing, Minnesota]. Sourced… https://www.rawpixel.com/image/12286574/photo-image-smoke-mountain-public-domainFree 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 license[Untitled photo, possibly related to: Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283476/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Dawn, Texas. Crossing Texas wheat country along the Atchison, Topeka, and Santa Fe… https://www.rawpixel.com/image/12293647/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Bingham Canyon, Utah. Open-pit workings of the Utah Copper Company, showing loaded ore… https://www.rawpixel.com/image/12295830/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Ore from Ruth copper pit is refined at mill in McGill, Nevada]. Sourced from the… https://www.rawpixel.com/image/12275072/photo-image-person-sky-smokeFree Image from public domain licenseShenandoah, Pennsylvania. A view of buildings, coal cars and tracks at Maple Hill mine, seen from shaft tower. Sourced from… https://www.rawpixel.com/image/12275532/photo-image-sky-smoke-public-domainFree Image from public domain licenseThoreau, New Mexico. Indian woman crossing the tracks as the conductor gives the highball along the Atchison, Topeka and… https://www.rawpixel.com/image/12294054/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Argonis, Kansas. Crossing wheat fields along the Atchison, Topeka, and Santa Fe… https://www.rawpixel.com/image/12290099/photo-image-cloud-sky-smokeFree Image from public domain licenseMiscellaneous lot of photographs by Barbara Wright. New Mexico. Sourced from the Library of Congress. https://www.rawpixel.com/image/12297965/photo-image-cloud-sky-smokeFree Image from public domain licenseMigrant disposing of trash before leaving Belcross, North Carolina for another job at Onley, Virginia. Sourced from the… https://www.rawpixel.com/image/12264537/photo-image-plant-person-skyFree Image from public domain license[Untitled photo, possibly related to: Log rafts in Columbia River. Cowlitz County, Washington] by Russell Lee https://www.rawpixel.com/image/12151887/image-cloud-plant-artFree Image from public domain license[Untitled photo, possibly related to: Duors, New Mexico. Going across sheep and cattle country along the Atchison, Topeka… https://www.rawpixel.com/image/12293768/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Spring pulpwood drive on the Brown Company timber holdings in Maine. The lake… https://www.rawpixel.com/image/12295607/photo-image-plant-person-boomFree Image from public domain license[Untitled photo, possibly related to: Railroad yards and houses. Du Bois, Pennsylvania]. Sourced from the Library of… https://www.rawpixel.com/image/12274949/photo-image-cloud-frame-plantFree Image from public domain license[Untitled photo, possibly related to: Guanica, Puerto Rico (vicinity). Burning a sugar cane field. This is a process that… https://www.rawpixel.com/image/12280863/photo-image-cloud-sky-leavesFree Image from public domain license[Untitled photo, possibly related to: View of East Mauch Chunk from Upper Mauch Chunk with Lehigh River in foreground. Mauch… https://www.rawpixel.com/image/12276718/photo-image-plant-person-skyFree Image from public domain licenseJones and Laughlin Steel Company, Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283589/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Section of Rosedale Mining Company. Shanties by the river (burning slag pile to… https://www.rawpixel.com/image/12248834/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Albany Mine, Hibbing, Minnesota]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12285034/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Houses in Baden, Pennsylvania. In the background is the Jones and Laughlin Steel Plant… https://www.rawpixel.com/image/12277818/photo-image-background-plant-personFree Image from public domain license[Untitled photo, possibly related to: Rehabilitation Administration loan supervisor, St. Charles Parish, near New Orleans… https://www.rawpixel.com/image/12271084/photo-image-plant-person-grassFree Image from public domain licenseKingman (vicinity), Arizona. A train on the Atchison, Topeka and Santa Fe Railroad between Seligman, Arizona and Needles… https://www.rawpixel.com/image/12292632/photo-image-person-sky-smokeFree Image from public domain licenseThe Pittsburgh Crucible Steel Company of Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277796/photo-image-plant-person-skyFree Image from public domain licenseWoman Enjoy Color Smoke Bomb Outdoors https://www.rawpixel.com/image/39035/premium-photo-image-adult-alone-asianView license[Untitled photo, possibly related to: Carloads of fruits and vegetables at terminal. Pittsburgh, Pennsylvania]. Sourced from… https://www.rawpixel.com/image/12287300/photo-image-cloud-person-skyFree Image from public domain licenseBingham Copper Mine, Utah. Main hill operations with Copper Heights homes and main shops as seen from top of the office… https://www.rawpixel.com/image/12297485/photo-image-sky-smoke-oceanFree Image from public domain license[Untitled photo, possibly related to: View of upper Mauch Chunk from East Mauch Chunk. In the background is Mount Pisgah and… https://www.rawpixel.com/image/12275462/photo-image-background-plant-smokeFree Image from public domain licenseHouses in west Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277956/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Kingman (vicinity), Arizona. A train on the Atchison, Topeka and Santa Fe Railroad… https://www.rawpixel.com/image/12292663/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Yauco, Puerto Rico (vicinity). Young ox cart driver in a sugar cane field]. Sourced… https://www.rawpixel.com/image/12280228/photo-image-face-plant-personFree Image from public domain licenseManati, Puerto Rico. Federal housing project. Sourced from the Library of Congress. https://www.rawpixel.com/image/12279898/photo-image-cloud-plant-skyFree Image from public domain licenseDanville, Vermont. Early morning view overlooking the town. Sourced from the Library of Congress. https://www.rawpixel.com/image/12297850/photo-image-plant-person-skyFree Image from public domain licenseSkyline, midtown Manhattan, New York City. Sourced from the Library of Congress. https://www.rawpixel.com/image/12270296/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: A freighter pulling into New York Harbor]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12264375/photo-image-sky-smoke-animalFree Image from public domain license