National longitudinal study base year, first, second, and third follow-up data file users manual
de National Center for Education Statistics.
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- National longitudinal study base year, first, second, and third follow-up data file users manual (1979)
Dept. of Health, Education, and Welfare, Education Division, National Center for Education Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off. · inglés