Time spent teaching core academic subjects in elementary schools : comparisons across community, school, teacher, and student characteristics / Marianne Perie, David P. Baker, Sharon Bobbitt. [electronic resource]
Imprint
Washington, DC : U.S. Dept. of Education, Office of Educational Research and Improvement : For sale by the U.S. G.P.O., Supt. of Docs., [1997]
