- Coin types, i.e. RIC numbers. In order to be included in the corpus, all coin types must have been checked by direct examination, that is to say, inspected visually or verified by photograph. The coin types described in older publications and not reviewed have therefore been excluded.

- Specimens. On the other hand, specimens have been taken into consideration, even if not reproduced but mentioned in publications, in particular in catalogues of large coin hoards, if the coin type to which they belong has already been recorded.

Within a material as abundant as ours, the die links between specimens are very numerous and prove that our documents provide a high degree of coverage; but only the most significant have been recorded.