"Bibliographia Oziana" by Douglas G. Greene and Peter E. Hanff serves as the standard reference work that sorts out the extremely complex printing history of each of the original forty Oz books by L. Frank Baum and his six successors. In addition, it includes full descriptions of Oz-related works by the same authors. The 136 photographic illustrations complement the textual descriptions, making "Bibliographia Oziana" particularly helpful to those who are new to the field.