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by 60th National Open Hearth and Basic Oxygen Steel Conference Pittsburgh April 17-20, 1977.
by 59th National Open Hearth and Basic Oxygen Steel Conference St. Louis meeting March 28-31, 1976.
by 58th National Open Hearth and Basic Oxygen Steel Conference Toronto April 13-16, 1975.
by 57th National Open Hearth and Basic Oxygen Steel Conference Atlantic April 28 - May 1, 1974.
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