Yes, I know Enchiridion Patristicum by Rouët de Journel isn't a household name that trips off every tongue. But I have been doing some cross-referencing of Denzinger/Jurgens/Willis/ et.al. to make them more useful in Verbum and have discovered that the lack of this resource is makes a serious hole in my work.
[quote]The Enchiridion Patristicum is a classic reference work in the field of patristic categorization and reference. First compiled in 1911, this work has gone through over 24 editions and Rouët de Journel’s numeric referencing system is still cited by modern patristic reference works, including John Willis’ Teachings of the Church Fathers and William Jurgens’ Faith of the Early Fathers. Arranged chronologically and thoroughly indexed according to subject, this work is necessary for any bibliography on early church history or any study on ancient ecclesiastical writings.