Physical description for original version: 117 p. : 28 cm
書誌注記
Includes bibliographies
原資料等に関する注記
原資料の出版事項: [Washington, D.C.?] : U.S. Dept. of Education, Office of Educational Research and Improvement, Center for Education Statistics : For sale by the Supt. of Docs., U.S. G.P.O., 1987