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Panama Canal construction showing workers drilling holes for dynamite in bedrock, as they cut through mountains of the Isthmus. Steam shovels in the background move the rubble to railroads car. 1913.
Overalls, hard hat and tools on light gray background
Happy Labor day concept, steel tool and spare parts on crumpled paper American flag background
Happy labor day calligraphy. Labor day holiday in United States of America. Abstract watercolor background with stars in colors of USA flag.
A house construction carpenter in africa at work industry

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