To understand the aging process : the Baltimore longitudinal study of the National Institute on Aging.

Mode of access: Internet.

National Education Longitudinal Study of 1988 : first follow-up : student component data file user's manual /

"May 1992."

To understand the aging process : the Baltimore longitudinal study of the National Institute on Aging /

Originally published in 1978 by the U.S. Dept. of Health, Education and Welfare, and issued as DHEW publication no. (NIH) 78-134.

National longitudinal study of the high school class of 1972 : sample design efficiency study : optimal two-stage sample design /

"Prepared by Research Triangle Institute under contract no. OEC-0-73-6666 with U.S. Dept. of Health, Education, and Welfare."

Illinois public community colleges statewide occupational student follow-up study : final report of a three year longitudinal study of fall 1974 new students enrolled in occupational programs.

Cover title.

National longitudinal study of the high school class of 1972 : sample design efficiency study: effects of stratification, clustering, and unequal weighting on the variances of NLS statistics /

Project officer: William B. Fetters.

Development techniques and organizatinal change : an overview of results from the Michigan inter-company longitudinal study : technical report /

"Funded by the Office of Naval Research, Group Psychology Programs, under Contract no. N00014-67-A-0181-0013, NR 170-719/7-29-68 (Code 452)"