Public domain
Steel manufacture, Allegheny-Ludlum. This doesn't look very impressive, just a pile of rock. Well, that's what it is, a pile of limesone, but since limestone is the main ingredient for the refining of high quality steels, heaps of rock such as these mighty important factors in the maintenance of def
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineSteel manufacture, Allegheny-Ludlum. This doesn't look very impressive, just a pile of rock. Well, that's what it is, a pile of limesone, but since limestone is the main ingredient for the refining of. 1940-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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