[Untitled photo, possibly related to: Loading seventy ton cars with iron ore, Mahoning pit, Hibbing, Minnesota]. Sourced… https://www.rawpixel.com/image/12286260/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/12294158/photo-image-sky-technology-public-domainFree Image from public domain license[Untitled photo, possibly related to: Topeka, Kansas. Lifting an engine with the eighty-ton cranes at the Atchison, Topeka… https://www.rawpixel.com/image/12290301/photo-image-person-airplane-public-domainFree Image from public domain license