This volume, which constitutes the third in the series Jewish Research Literature, is divided into two parts. Part One offers detailed descriptions of the various Judaic dictionaries with biographical information on their compilers, beginning with Rav Saadiah Gaon's early tenth-century Egron and concluding with modern dictionaries compiled in recent years. Bibliographical lists and summaries, arranged chronologically according to date of publication, supplement the text. The narrative is written in nontechnical style, but technical information appears in the footnotes. Part Two, which deals with concordances, citation collections, proverbs, and folk sayings, will appear separately.