National longitudinal study of the high school class of 1972 [electronic resource] : NLS-72 / National Center for Education Statistics, Office of Educational Research and Improvement, U.S. Department of Education.
- Washington, DC : for sale by the U.S. G.P.O., Supt. of Docs., [1994?]
- Government document
1 computer laser optical disk ; 4 3/4 in.