A Section of the Constellation Cygnus (August 13, 1885). Original public domain image from The MET. 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Work Projects Administration (WPA) vocational school. Skilled automobile mechanics are of vital importance to our… https://www.rawpixel.com/image/12241079/photo-image-person-factory-manFree Image from public domain licenseBusiness brainstorm iPhone wallpaper, vector illustration https://www.rawpixel.com/image/9188965/image-wallpaper-iphone-paperView licenseBusiness brainstorm desktop wallpaper, vector illustration https://www.rawpixel.com/image/9188955/image-wallpaper-desktop-paperView licenseMechanical milking apparatus on farm in Black Canyon Project. 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Lake Dick Project, Arkansas by Russell Lee https://www.rawpixel.com/image/12172750/image-plant-person-artFree Image from public domain licenseTraining. Work Projects Administration (WPA) vocational school. The complicated mechanism of an airplane engine will be no… https://www.rawpixel.com/image/12307011/image-person-airplane-factoryFree Image from public domain licenseColleagues sharing ideas hexagonal shaped badge https://www.rawpixel.com/image/9211350/colleagues-sharing-ideas-hexagonal-shaped-badgeView licenseTraining. Work Projects Administration (WPA) vocational school. The complicated mechanism of an airplane engine will be no… https://www.rawpixel.com/image/12307219/image-person-airplane-technologyFree Image from public domain licenseMechanical digger opening a sewer line at the Berwyn, Maryland project. Sourced from the Library of Congress. https://www.rawpixel.com/image/12309002/image-plant-people-treeFree Image from public domain licenseTraining. 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