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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8770512

S. P. Graves, instrument man, working on new construction bridge at Norris Dam, October 1933. Photographer: Hine, Lewis. Original public domain image from Flickr

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S. P. Graves, instrument man, working on new construction bridge at Norris Dam, October 1933. Photographer: Hine, Lewis. Original public domain image from Flickr

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