Civil engineering: railway bridges at Kaunas. Lithograph by J. R. Jobbins after F. H. Horne. https://www.rawpixel.com/image/13988768/image-background-pattern-public-domainFree Image from public domain licenseCentral Vermont Iron Bridge. Side View. by Reuben M McIntosh https://www.rawpixel.com/image/14298408/central-vermont-iron-bridge-side-view-reuben-mcintoshFree Image from public domain licenseArchitecture: two composite roof trusses. Engraving by E. Turrell, 1847. https://www.rawpixel.com/image/13972517/architecture-two-composite-roof-trusses-engraving-turrell-1847Free Image from public domain licenseThe Royal Gorge, Grand Cañon of the Arkansas by William Henry Jackson https://www.rawpixel.com/image/14274062/the-royal-gorge-grand-canon-the-arkansas-william-henry-jacksonFree Image from public domain licenseThe Iron Bridge Leading from the Residency to Cantonements by Felice Beato https://www.rawpixel.com/image/14324699/the-iron-bridge-leading-from-the-residency-cantonements-felice-beatoFree Image from public domain licenseCivil engineering: the iron bridge at Coalbrookdale, with a ship sailing beneath. Engraving. https://www.rawpixel.com/image/13994056/image-cow-art-skyFree Image from public domain licenseFront porch of Negro tenant farmer's home. Kansas. Sourced from the Library of Congress. https://www.rawpixel.com/image/12310849/image-person-pattern-woodFree Image from public domain licenseLondon seen from the dome of St Paul's Cathedral at the opening of New London Bridge. Lithograph by C.J. Grant, 1831. https://www.rawpixel.com/image/13987153/image-paper-cartoon-personFree Image from public domain licenseBollman Iron Bridge, Harpers Ferry, W. Va. by William M Chase https://www.rawpixel.com/image/14289242/bollman-iron-bridge-harpers-ferry-va-william-chaseFree Image from public domain licenseVoormalige winkel van Cluett, Peabody and Co. na de aardbeving in San Francisco (1906) by Tom M Phillips, anonymous and… https://www.rawpixel.com/image/13758149/image-sky-road-public-domainFree Image from public domain licenseA view of The Getty park through a steel fence. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3294286/free-photo-image-los-angeles-architecture-banisterFree Image from public domain licenseIron R.R. Bridge - Portage, N.Y. - 240 ft. High, 820 ft. Long. by L E Walker https://www.rawpixel.com/image/14303376/iron-rr-bridge-portage-ny-240-ft-high-820-ft-long-walkerFree Image from public domain licenseMenufia Canal, Egypt: reconstruction work to the first Aswan Dam: trollies bearing construction materials. Photograph by F.… https://www.rawpixel.com/image/13982939/photo-image-person-airplane-technologyFree Image from public domain licenseCases of mental disease, with practical observations on medical treatment. For the use of students / by Alexander Morison. https://www.rawpixel.com/image/13986069/image-paper-cartoon-faceFree Image from public domain license[Untitled photo, possibly related to: Section of Amoskeag looking east from west bank of river, just north of Granite Street… https://www.rawpixel.com/image/12311190/image-public-domain-basketball-blackFree Image from public domain licenseCross-sections of a finery and furnace used in the processing of iron. Engraving by Wilson Lowry after J. Farey. https://www.rawpixel.com/image/13982004/image-paper-cross-patternFree Image from public domain licenseMachinery: a pile-driving hammer, mounted on existing piles, with two men operating it. Engraving after J. Besson. https://www.rawpixel.com/image/13998604/image-paper-cartoon-personFree Image from public domain licenseIndustrial building with connecting steel walkways https://www.rawpixel.com/image/534673/free-photo-image-factory-architectural-architectureView licenseFreight train operations on the Chicago and Northwestern Railroad between Chicago and Clinton, Iowa. The train crosses a… https://www.rawpixel.com/image/12290900/photo-image-person-crosses-public-domainFree Image from public domain licenseShenandoah, Pennsylvania. Second shaft tower at Maple Hill mine, as seen from first tower. Sourced from the Library of… https://www.rawpixel.com/image/12275785/photo-image-person-sky-mountainFree Image from public domain license[Untitled photo, possibly related to: Phelps Dodge refining company, El Paso, Texas. Copper is recovered from smoke that… https://www.rawpixel.com/image/12295410/photo-image-plant-sky-smokeFree Image from public domain licenseObservation stand for largest open pit iron mine in the world. Hibbing, Minnesota. Sourced from the Library of Congress. https://www.rawpixel.com/image/12286282/photo-image-person-sky-public-domainFree Image from public domain license[Untitled photo, possibly related to: Cleveland, Ohio. Unloading iron ore from a lake freighter by means of Hewlett [i.e.… https://www.rawpixel.com/image/12294145/photo-image-person-sky-public-domainFree Image from public domain licenseCleveland, Ohio. Unloading iron ore from a lake freighter by means of Hewlett [i.e., Hulett] unloaders at the Pennsylvania… https://www.rawpixel.com/image/12294151/photo-image-person-public-domain-factoryFree Image from public domain licenseIron ore docks at Allouez, Wisconsin. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284901/photo-image-cloud-sky-public-domainFree Image from public domain license[Untitled photo, possibly related to: Bingham Copper Mine, Utah. Main assembly yards, office, shops, air compressor and… https://www.rawpixel.com/image/12297481/photo-image-sky-public-domain-officeFree Image from public domain licenseIron ore docks. Allouez, Wisconsin. Sourced from the Library of Congress. https://www.rawpixel.com/image/12285165/photo-image-sky-public-domain-waterFree Image from public domain licenseLemont, Illinois. Crossing the drainage canal along the Atchison, Topeka, and Santa Fe Railroad between Chicago, and… https://www.rawpixel.com/image/12290134/photo-image-public-domain-arch-waterFree Image from public domain licenseOperating lever which controls chute, extending from bin where iron ore is stored. Ore docks, Allouez, Wisconsin. Sourced… https://www.rawpixel.com/image/12286428/photo-image-cloud-person-skyFree Image from public domain licenseNew York, New York. Looking south at 7 a.m. from 13th Street on Second Avenue, showing the elevated railway in midst of… https://www.rawpixel.com/image/12288585/photo-image-person-sky-lightFree Image from public domain license[Untitled photo, possibly related to: Middletown, Connecticut, with a bridge across the Connecticut River]. Sourced from the… https://www.rawpixel.com/image/12279094/photo-image-sky-public-domain-archFree Image from public domain licenseIron ore dock. Grain elevator and coal loading docks in background. Allouez, Wisconsin. Sourced from the Library of Congress. https://www.rawpixel.com/image/12286174/photo-image-background-cloud-skyFree Image from public domain licenseCleveland, Ohio. Unloading iron ore from a lake freighter by means of Hewlett [i.e., Hulett] unloaders at the Pennsylvania… https://www.rawpixel.com/image/12293890/photo-image-person-sky-public-domainFree Image from public domain license[Untitled photo, possibly related to: Freight train operations on the Chicago and Northwestern Railroad between Chicago and… https://www.rawpixel.com/image/12290901/photo-image-technology-crosses-public-domainFree Image from public domain licenseBarbed wire-surrounded barracks for Florida migrants working at Webster Canning Company, Cheriton, Virginia. Sourced from… https://www.rawpixel.com/image/12264699/photo-image-plant-grass-skyFree Image from public domain licenseA guard stationed at Sibley bridge across the Missouri river along the route of the Atchison, Topeka, and Santa Fe Railroad… https://www.rawpixel.com/image/12290027/photo-image-plant-person-skyFree Image from public domain licenseMorenci, Arizona. Conveyor gallery where the copper is taken to the smelter, as shown in the background. Sourced from the… https://www.rawpixel.com/image/12294407/photo-image-background-public-domain-waterFree Image from public domain licenseRailroad trestle. Ontonagon County, Michigan. Sourced from the Library of Congress. https://www.rawpixel.com/image/12286510/photo-image-plant-sky-public-domainFree Image from public domain license[Untitled photo, possibly related to: Loading sheep for eastern packing plants. Stockyards, Denver, Colorado]. Sourced from… https://www.rawpixel.com/image/12274571/photo-image-background-plants-personFree Image from public domain licenseCleveland, Ohio. Unloading iron ore from a lake freighter by means of Hewlett [i.e., Hulett] unloaders at the Pennsylvania… https://www.rawpixel.com/image/12293878/photo-image-person-sky-public-domainFree Image from public domain license[Untitled photo, possibly related to: Cleveland, Ohio. Unloading iron ore from a lake freighter by means of Hewlett [i.e.… https://www.rawpixel.com/image/12293838/photo-image-person-sky-public-domainFree Image from public domain licenseSibley, Missouri. Crossing the Missouri River along the route of the Atchison, Topeka, and Santa Fe Railroad between… https://www.rawpixel.com/image/12291468/photo-image-sky-public-domain-archFree Image from public domain license