00553nam a22001937i 450000500170000000800410001704100080005810000180006624500650008465000220014965000220017165000170019365000230021065100110023365300150024465500150025970000110027477300740028520141212093507.0940916s1994    sp     gr     000 0 spa c  aeng1 aSWISHER, J.D.10aAN EVALUATION OF STUDENT ASSISTANCE PROGRAMS IN PENNSYLVANIA14aDrogodependencias14aEntorno educativo14aEvaluación14aPrograma educativo14aEE.UU.10aAdicciones 4aDocumental1 aET AL.0 tJOURNAL OF ALCOHOL AND DRUG EDUCATIONgVol. 39, no. 1 (1993), p. 1-18