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Sourced from the Library of Congress. https://www.rawpixel.com/image/12334594/image-face-person-public-domainFree Image from public domain license[Untitled photo, possibly related to: Elmer Womack, derrick man from Fairfax, Oklahoma overhauling mud hog where oil well is… https://www.rawpixel.com/image/12335111/image-face-person-skyFree Image from public domain license[Untitled photo, possibly related to: Cable tool driller, Seminole oil field, Oklahoma] by Russell Lee https://www.rawpixel.com/image/12168809/image-face-person-artFree Image from public domain licenseRice being fed into polishing machine from chutes. Abbeville, Louisiana by Russell Lee https://www.rawpixel.com/image/12172510/image-background-person-artFree Image from public domain licenseConversion. Automobiles to 40 mm. anti-aircraft guns. To ensure maximum efficiency, every 40 mm. anti-aircraft gun barrel… https://www.rawpixel.com/image/12306811/image-plant-hand-personFree Image from public domain license