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lecture by Walter Hays Uploading date: November 06, 2015 More lectures at Disasters Supercourse - http://www.pitt.edu/~super1/disasters/BADisasterSupercourse.htm PPT original - http://www.pitt.edu/~super7/53011-54001/53791.ppt URL: http://www.pitt.edu/~super1/lecture/lec53791/index.htm