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1. 40 Years ofSound Changein ProgressWilliam LabovUniversity ofPennsylvaniaNWAV40 Georgetown Oct 29 2011 2. Two forty-year spansNWAVE 1 1972 LING560 1972Linguistic ChangeThe…

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1. 40 Years ofSound Changein ProgressWilliam LabovUniversity ofPennsylvaniaNWAV40 Georgetown Oct 29 2011 2. Two forty-year spansNWAVE 1 1972 LING560 1972Linguistic ChangeThe…