http://www.piersystem.com/go/doctype/1397/22842/ http://www.piersystem.com/go/doc/1397/180894/ http://www.piersystem.com/go/doc/1397/180894/ Links University of North Carolina 2008-07-03T12:13:37Z http://www.piersystem.com/go/doc/1397/181699/ http://www.piersystem.com/go/doc/1397/181699/ Links University of North Carolina 2007-11-08T17:35:15Z http://www.piersystem.com/go/doc/1397/180893/ http://www.piersystem.com/go/doc/1397/180893/ Links University of North Carolina 2007-11-01T17:25:38Z