"A Blast Furnace", http://www.flickr.com/photos/nationalarchives/8766040824/ "A Blast Furnace", autor Clive Gardiner, 1927-33; plakat ze zbiorów "The National Archives UK";

„A Blast Furnace”, http://www.flickr.com/photos/nationalarchives/8766040824/ „A Blast Furnace”, autor Clive Gardiner, 1927-33; plakat ze zbiorów „The National Archives UK”;