Public domain
Washington, D.C. Construction of a bridge and road near Independence Avenue and 14th and 16th Streets, S.W. Waterproof paper is placed on a prepared subgrade before pouring the concrete to prevent the water in the mixture from being soaked up by the soil. The water stays in the concrete, making it s
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Credit lineWashington, D.C. Construction of a bridge and road near Independence Avenue and 14th and 16th Streets, S.W. Waterproof paper is placed on a prepared subgrade before pouring the concrete to prevent the. 1942-01-01. Ferrell, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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Washington, D.C. Construction of a bridge and road near Independence Avenue and 14th and 16th Streets, S.W. The man in the foreground is shoveling concrete into a low spot
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