Publication Type:
Report
Source:
U.S. Dept. of Education, Institute of Education Sciences, National Center for Educational Evaluation and Regional Assistance, Volume Report number: NCEE 2009-4052, Washington, D.C., p.148 (2009)
URL:
http://purl.access.gpo.gov/GPO/LPS117612
Keywords:
Academic achievement--United States,
Education,
Elementary--Curricula--United States,
Mathematics--Study and teaching (Elementary)--United States