Bibliographia Oziana: A Concise Bibliographical Checklist of the Oz Books by L. Frank Baum and His Successors, by Douglas G. Greene and Peter E. Hanff, is a key resource on the scholarship on L. Frank Baum and the Oz book series. The first edition was published in 1976, with a revised and expanded edition appearing in 1988, both from The International Wizard of Oz Club. A third edition followed in 2002. (The subtitle of the work varies from edition to edition, though the title is consistent.)