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https://krimdok.uni-tuebingen.de/Search/Versions?id=1080172637&keys[0]=AT powersedwin anexperimentinthepreventionofdelinquencythecambridgesomervilleyouthstudy&keys[1]=AT witmerhelenl anexperimentinthepreventionofdelinquencythecambridgesomervilleyouthstudy&keys[2]=AT powersedwin experimentinthepreventionofdelinquencythecambridgesomervilleyouthstudy&keys[3]=AT witmerhelenl experimentinthepreventionofdelinquencythecambridgesomervilleyouthstudy