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Agodini R, Pendleton A, of(U.S.) IE, for and(U.S.) NC. Achievement effects of four early elementary school math curricula [electronic resource] : findings from first-graders at 39 schools. Vol Report number: NCEE 2009-4052. Washington, D.C.: U.S. Dept. of Education, Institute of Education Sciences, National Center for Educational Evaluation and Regional Assistance; 2009.