PITTSBURGH, Sept. 16, 2013 /PRNewswire-USNewswire/ -- United Steelworkers (USW) members at four Packaging Corporation of America (PCA) mills have voted by a 7-to-1 margin to ratify a new contract with the company. (Logo: http://photos.prnewswire.com/prnh/20080131/DC12982LOGO) The......
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