[Untitled photo, possibly related to: Miner attaching airhose to power drill which he will use in drilling contest, Labor… https://www.rawpixel.com/image/12171719/image-people-art-vintageFree Image from public domain licenseMiner attaching airhose to power drill which he will use in drilling contest, Labor Day celebration, Silverton, Colorado by… https://www.rawpixel.com/image/12171609/image-person-art-vintageFree Image from public domain license[Untitled photo, possibly related to: Miner attaching airhose to power drill which he will use in drilling contest, Labor… https://www.rawpixel.com/image/12171988/image-people-art-vintageFree Image from public domain license[Untitled photo, possibly related to: Freight operations on the Indiana Harbor Belt railroad between Chicago, Illinois and… https://www.rawpixel.com/image/12337238/image-person-technology-public-domainFree Image from public domain license[Untitled photo, possibly related to: Miner attaching airhose to power drill which he will use in drilling contest, Labor… https://www.rawpixel.com/image/12172833/image-people-art-vintageFree Image from public domain license[Untitled photo, possibly related to: Miner attaching airhose to power drill which he will use in drilling contest, Labor… https://www.rawpixel.com/image/12171626/image-people-art-vintageFree Image from public domain licenseFreight operations on the Indiana Harbor Belt railroad between Chicago, Illinois and Hammond Indiana. Part of the train… https://www.rawpixel.com/image/12291100/photo-image-person-public-domain-manFree Image from public domain license