This book, first published in 1989, is a comprehensive look at PaULS, the Pennsylvania Union List of Serials. The editors, both of whom have extensive experience with online union listing, have collected the previously published articles recording the development and implementation of PaULS; compiled new articles representing updated perspectives; provided the PaULS procedure manual; and included an annotated bibliography of literature about online union listing. Contributors to this fascinating volume describe extensive union listing activities of West Virginia University, a special library, Calgon Corporation, and a regional consortia, the Lehigh Valley Association of Independent Colleges.