Since 1982 many volumes in the Corpus Christianorum Series
Latina and Continuatio Mediaevalis have been
accompanied by an Instrumenta volume, offering the
necessary linguistic complement to the corresponding edition. Part
of the information is printed while the other part is on
microfiche. Series A (Formae) volumes contain an
Enumeratio formarum (i.e. a printed list of all
the word-forms together with the frequency of their
occurrence), a Concordantia formarum (i.e. a microfiche
edition of a complete concordance of all the forms), and an
Index formarum a tergo ordinatarum. The Instrumenta
Lexicologica Latina are part of the Thesaurus Patrum
Latinorum, which has been compiled by means of systematic
computer processing of the writings of the Latin Fathers of the
Church and the works of the Middle Ages.