00311    a2200121   4500020001500000082001700015245006000032260002800092300001900120650001500139650001700154650001800171  a9241561548  a305.235bHEA  aThe health of young people ba challenge and a promise   aGenevabWHOc1993g1993  aix,109p.c24cm  aAge groups  aYoung people  aSocial groups