MAP20150025173 Williams, Pamela R. D. Applying risk analysis to two divisive topics : hydraulic fracking and marijuana use / Pamela R. D. Williams En: Risk analysis : an international journal. - McLean, Virginia : Society for Risk Analysis, 1987-2015 = ISSN 0272-4332. - 04/05/2015 Volumen 35 Número 5 - mayo 2015 I. Título.