US Library of Congress photos
The US Library of Congress is based in Washington and has about 14 million historical photographs (amongst other things, they are the world’s biggest library apparently). They are beginning to put some of their collection on Flickr. It’s well worth a look. Link
This photo is by Palmer, Alfred T, and is of an electric phosphate smelting furnace used in the making of elemental phosphorus in a TVA chemical plant in the Muscle Shoals area, Alabama. 1942.
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