National Geographic : 1943 May
Siberian Coal Baked in a Row of Ovens Emerges as Smelting Coke and Gas Only porous carbon, producing tremendous heat when burned in blast furnaces, remains. The fumes are piped off to fire open-hearth furnaces and tofeed the chemical plant. Here, in the Kuznetsk Coal Basin, tracks surmount the ovens. Gas belches from anopen pipe.