This document contains the codebooks and data record layouts for the 1985-86 Public-Use Data Tapes, Version 1.0. The Public-Use data tapes are created by the National Assessment of Educational Progress (NAEP) to provide outside researchers access to NAEP data. This book provides coded data collected on and from third graders and 9-year-olds via student tests in mathematics, science, computer competence, literature, and U.S. history, as well as coded background information obtained from questionnaires given to students, teachers, and principals. The tests and questionnaires were presented in a Balanced Incomplete Block (BIB) spiralling design in which each student received only some of the questions from each learning area. Items from each learning area were then assembled into blocks, which were in turn assembled into booklets. At each grade/age level, booklets 1-5 are "bridge" instruments, used to measure effects of changes in student age definition, time of testing, and mode of administration. This entire book contains data files for grade 3/age 9, including student BIB spiral data, bridge booklets 1-5, and responses to school questionnaire items. (JGL)