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U.S. Dept. of Health, Education, and Welfare, Office of Education, National Center for Educational Statistics; [for sale by the Supt. of Docs., U.S. G.P.O.1969-<FD41-2>
by W. Vance Grant and Thomas D. SnyderU.S. Dept. of Education, Office of Educational Research and Improvement, National Center for Education Statistics : For sale by the Supt. of Docs., U.S. G.P.O.[1983]