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Pennsylvania School Librarians Association The Pennsylvania School Librarians Association PSLA is a professional organization for school library professionals and library educators. The Pennsylvania School Librarians Association works to ensure excellence in school library programs. Mission The Pennsylvania School Librarians Association is dedicated to transforming teaching and learning through quality school library programs. Vision A world of critically literate connected learners PSLA is a chapter of the American Association of School Librarians AASL a division of the American Library Association ALA.