Here is an informative volume featuring 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. For professionals specifically interested in online union lists of serials and for those who are interested in the record of a large cooperative undertaking, especially one that involved building and maintaining a database, this is a most valuable book.