The persistence of preschool effects :
a long-term follow-up of fourteen infant and preschool experiments : final report, grant no. 18-76-07843 to the Administration on Children, Youth, and Families, Office of Human Development [sic] Services, U.S. Department of Health, Education, and Welfare /
the Consortium on Developmental Continuity, Education Commission of the States ; analysis and final report by Irving Lazar ... [et al.].

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