Vintage protective suits from the Spanish flu pandemic background https://www.rawpixel.com/image/2302001/free-photo-image-retro-spanish-flu-vintageView licenseVintage protective suit from the Spanish flu pandemic background https://www.rawpixel.com/image/2302021/beautiful-icelandic-natureView licenseChicago, Illinois. Cutting a metal part for a locomotive at the Chicago and Northwestern Railroad repair shops. Sourced from… https://www.rawpixel.com/image/12288712/photo-image-face-person-public-domainFree Image from public domain licenseChicago, Illinois. Working on a locomotive at the Chicago and Northwestern Railroad repair shops. Sourced from the Library… https://www.rawpixel.com/image/12288541/photo-image-person-airplane-technologyFree Image from public domain license