coke gas, coking plant, coal pot, flame, beacon, ruhr area, duisburg, structural change, industry age, mechanization, heavy industry

coke gas, coking plant, coal pot, flame, beacon, ruhr area, duisburg, structural change, industry age, mechanization, heavy industry
coke gas, coking plant, coal pot, flame, beacon, ruhr area, duisburg, structural change, industry age, mechanization, heavy industry
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