A grammatical index of the urban Roman inscriptions is published in CIL VI, Parts 1–3. 4, Fasc. 1–3. 8, Fasc. 2–3.In additionto grammatical phenomena, account is also taken of stonemasons’ errors and striking writing habits. The irregular forms can be looked up in three indexes – an alphabetically arranged index of the irregular forms, an index of words and names for which irregular forms exist arranged alphabetically by headword, and an index arranged by subject groups of the type to be found in the grammatical indexes to other volumes in the CIL series. In each case, the indexes are selective.