This study establishes the link between the presence of adequate school library staffing and higher academic achievement as indicated by PSSA (Pennsylvania System of School Assessment) reading scores. School library staffing is correlated with such scores; as library staffing rises, reading scores rise. This correlation is not explained away by other school conditions, such as per pupil expenditures by school or the teacher-pupil ration. Likewise, the relationship is not explained away by community conditions, such as poverty and low adult educational attainment. Several characteristics of school library programs beyond staffing help to explain the relationship between library staffing and academic achievement. These characteristics include: school library expenditures; information resources; information technology; and staff activities that help to integrate information literacy into the school's approaches to standards and curricula. This report contains 14 data tables and several statements by school librarians. (MES)