Berkner, Lutz K.
Washington, DC : U.S. Dept. of Education, Office of Educational Research and Improvement, National Center for Education Statistics : [For sale by the U.S. G.P.O., Supt. of Docs., 1996]
1996
Berkner, Lutz K.
Washington, D.C. (555 New Jersey Ave., NW, Washington 20208-5574) : U.S. Dept. of Education, Office of Educational Research and Improvement, National Center for Education Statistics, [2000]
2000