U.S. Congress. Joint Committee to Investigate Dirigible Disasters, ca. 1933. Original public domain image from Flickr https://www.rawpixel.com/image/8799428/photo-image-vintage-public-domain-travelFree Image from public domain licenseSkyscraper building architecture in Prague. Free public domain CC0 photo. https://www.rawpixel.com/image/6033279/photo-image-public-domain-windows-freeFree Image from public domain license A portion of the largely modernist downtown skyline in Jacksonville, Florida, a regional cultural… https://www.rawpixel.com/image/8070675/photo-image-plant-tree-skyFree Image from public domain licenseUSSC (United States Sugar Corporation) hauls sugarcane from the fields to its mill by their own railroad system. Clewiston… https://www.rawpixel.com/image/12240495/photo-image-cloud-steam-personFree Image from public domain licenseNo. 8. Ye-nan-gyoung [Yenangyaung]. Kyoung. by Linnaeus Tripe https://www.rawpixel.com/image/8964910/no-ye-nan-gyoung-yenangyaung-kyoung-linnaeus-tripeFree Image from public domain licenseNo. 23. Pugahm Myo [Pagan]. Figures in Damayangyee Pagoda [Dhamma-yan-gyi]. by Linnaeus Tripe https://www.rawpixel.com/image/9050859/photo-image-paper-rose-flowersFree Image from public domain licenseMassive machinery at work in the open-pit Wyodak coal mine in the coal-rich Powder River Basin outside Gillette, Wyoming.… https://www.rawpixel.com/image/434361/free-photo-image-mining-public-domain-trains-carol-highsmithFree Image from public domain licenseUSSC (United States Sugar Corporation) hauls sugarcane from the fields to its mill by their own railroad system. Clewiston… https://www.rawpixel.com/image/12326750/image-cloud-plant-personFree Image from public domain licenseWheat field on the Schnitzler Corporation ranch. Froid, Montana. Sourced from the Library of Congress. https://www.rawpixel.com/image/12332635/image-cloud-plant-grassFree Image from public domain licenseGirls working at the Jones and Laughlin Steel Corporation going home after a day's work. Aliquippa, Pennsylvania. Sourced… https://www.rawpixel.com/image/12325330/image-person-public-domain-manFree Image from public domain licenseMorenci, Arizona. Loading copper ore from an open-pit mine into ore cars which transport the ore to the smelter plant at the… https://www.rawpixel.com/image/12294313/photo-image-plant-mountain-public-domainFree Image from public domain license[Untitled photo, possibly related to: The end of the afternoon shift at the Jones and Laighlin Steel Corporation. Aliquippa… https://www.rawpixel.com/image/12278020/photo-image-person-sky-public-domainFree Image from public domain licenseMorenci, Arizona. Loading copper ore from an open-pit mine on an ore train on its way to the smelter plant of the Phelps… https://www.rawpixel.com/image/12293221/photo-image-plant-person-skyFree Image from public domain licenseMorenci, Arizona. The copper mine railroad on which the ore is transported to the smelting plant of the Phelps Dodge mining… https://www.rawpixel.com/image/12294307/photo-image-background-plant-skyFree Image from public domain licenseMorenci, Arizona. An open-pit copper mine of the Phelps Dodge mining corporation. Sourced from the Library of Congress. https://www.rawpixel.com/image/12293225/photo-image-sky-mountain-public-domainFree Image from public domain licenseMorenci, Arizona. An ore train being loaded at one of the open-pit copper mines of the Phelps Dodge mining corporation.… https://www.rawpixel.com/image/12294311/photo-image-person-road-mountainFree Image from public domain license[Untitled photo, possibly related to: Morenci, Arizona. The copper mine railroad on which the ore is transported to the… https://www.rawpixel.com/image/12293237/photo-image-background-plant-skyFree Image from public domain licenseChanging shifts outside the Jones and Laughlin Steel Corporation. Aliquippa, Pennsylvania. Sourced from the Library of… https://www.rawpixel.com/image/12278747/photo-image-person-public-domain-natureFree Image from public domain license[Untitled photo, possibly related to: Morenci, Arizona. An open-pit copper mine of the Phelps Dodge mining corporation].… https://www.rawpixel.com/image/12293543/photo-image-sky-mountain-public-domainFree Image from public domain licenseThe end of the afternoon shift at the Jones and Laughlin Steel Corporation in Aliquippa, Pennsylvania. Sourced from the… https://www.rawpixel.com/image/12277744/photo-image-person-road-public-domainFree Image from public domain licenseMorenci, Arizona. Galleries in an open-pit cooper mine of the Phelps Dodge corporation showing strip mining. Sourced from… https://www.rawpixel.com/image/12293529/photo-image-road-mountain-public-domainFree Image from public domain licenseMorenci, Arizona. An ore train on its way to smelter from an open-pit cooper mine of the Phelps Dodge mining corporation.… https://www.rawpixel.com/image/12293250/photo-image-mountain-public-domain-natureFree Image from public domain license