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2. Company on the move: seventy-five years of Hoogovens;Nieuivenhuys,1993
3. Steeltown, USSR: Soviet society in the Gorbachev era;Kotkin,1991
4. The metallurgical combine of the future;Malenky,1932
5. Stahl schreibt Geschichte: 125 Jahre Wirtschaftsvereinigung Stahl;Uebbing,1999