Public domain
Bureau of Standards, testing concrete beams, 8/24/29
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
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Credit lineBureau of Standards, testing concrete beams, 8/24/29. 1929-01-01. National Photo Company Collection, Library of Congress. Public domain.
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Bureau of Standards, testing concrete beams, 8/24/29
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