Physical description for original version: vi, 30 p. : 28 cm
書誌注記
Includes bibliographical references
原資料等に関する注記
原資料の出版事項: Washington, D.C. : Center for Education Statistics, Office of Educational Research and Improvement, U.S. Dept. of Education : For sale by the Supt. of Docs., U.S. G.P.O., [1987?]