"This study was supported by Contract No. RN96131001 between the National Academy of Sciences and the U.S. Department of Education. Support of the work of the Committee on National Statistics is provided by a consortium of federal agencies through a grant from the National Science Foundation (Number SBR-9709489)"--T.p. verso
Includes bibliographical references (p. 256-250)
Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries