Student library assistants and undergraduate and graduate students from agricultural and biological engineering, biological sciences, and entomology participated in a study to determine the effectiveness of instructional materials adapted to specific science disciplines for developing practical skills in the use of library resources. All students participating in the study completed a core section of workbook chapters and assignments covering basic library research tools in the sciences, while specific instruction by subject area and discipline was provided in the index and abstract chapters of the various workbooks. A group of students in biological sciences who served as a control group did not use workbooks. All students took a pretest and identical posttest as a measure of their capability in usage of library materials. Results of the study showed that students completing the workbook had significantly greater score increases on the standard test than those to whom the workbook was not available. Workbook content, timetables for assignment completion, assignment correction, workbook editing and printing, project cost, and library staff involvement are discussed. A two-phase program of science-related library instruction is outlined. Four tables, two figures, and three references are provided with workbook tables of contents and student test scores appended. (Author/ESR)