National Center for Education Statistics, U.S. Dept. of Education, Office of Educational Research and Improvement : For sale by the U.S. G.P.O., Supt. of Docs.,

U.S. Dept. of Education, Office of Educational Research and Improvement,

National Center for Education Statistics, U.S. Dept. of Education, Office of Educational Research and Improvement,

National Center for Education Statistics, U.S. Dept. of Education, Office of Educational Research and Improvement,

National Center for Education Statistics, U.S. Dept. of Education, Office of Educational Research and Improvement : [For sale by the U.S. G.P.O., Supt. of Docs.,

National Center for Education Statistics, U.S. Dept. of Education, Office of Educational Research and Improvement : For sale by the U.S. G.P.O., Supt. of Docs.,

U.S. Dept. of Education, Office of Educational Research and Improvement, Educational Resources Information Center : National Center for Education Statistics,

U.S. Dept. of Education, Office of Educational Research and Improvement, Educational Resources Information Center : National Center for Education Statistics,

U.S. Dept. of Education, Office of Educational Research and Improvement, National Center for Education Statistics : Educational Resources Information Center,

National Center for Education Statistics, U.S. Dept. of Education, Office of Educational Research and Improvement : U.S. Dept. of Education, Office of Educational Research and Improvement, Educational Resources Information Center,

National Center for Education Statistics ;

U.S. Dept. of Education, Office of Educational Research and Improvement, National Center for Education Statistics : Educational Resources Information Center,