00557nam a2200109Ia 4500008004100000020001800041100009300059245021100152260002700363650001400390856004300404171212s9999    xx            000 0 und d  a9780833025302  aKaroly, Lynn A.;Greenwood, Peter W.;Everingham, Susan S.;Hoube, Jill;Kilburn, M. Rebecca  cKaroly, Lynn A.;Greenwood, Peter W.;Everingham, Susan S.;Hoube, Jill;Kilburn, M. RebeccaaInvesting in Our ChildrenbWhat We Know and Don't Know About the Costs and Benefits of Early Childhood Interventions  bRAND Corporationc1998  aEducation  uwww.jstor.org/stable/10.7249/mr898tcwf