One of the biggest problems in education is that of showing the necessity for the provision of library services and demonstrating the difference it makes in academic achievement. An even bigger difficulty, perhaps, has been the existence and application of instruments capable of giving statistical evidence. The problem of this study was to determine if library services, meaning of orientation, extent, use, and accessibility of books, materials, equipment and services by a qualified librarian, would produce a measurable increase in academic achievement over that of students who are not exposed to similar resources. The investigation involved two groups of twelfth grade students. One group used extensive library services with independent study under a librarian's supervision; in the other group library services were incidental. Comparing College Verbal Scholastic Aptitude Test scores for each group before and after the study, it is evident that academic achievement can accrue when students are exposed to library services. (Author/SG)