This volume is designed as a comprehensive guide to the National Longitudinal Surveys of Labor Market Experience (NLS) which are concerned with the labor market experience of middle-aged and young men and women. Detailed descriptions of the objectives of the surveys, the samples covered, and the types of information collected are presented. Information on the availability and cost of computer tapes on which these data are stored is provided. Numerous tables indicate the more important variables included in the data tapes covering the first ten years for each of the surveys conducted. These variables are divided into major areas for each of the four groups (men, women, boys, girls) surveyed: (1) labor market experience variables; (2) human capital and other socioeconomic variables; and (3) environmental variables. An extensive bibliography is included in this handbook. Sample pages from NLS documentation are also appended. (Author/EB)