Did you know that DAI cooperates with OCRE – Online Coins of the Roman Empire? OCRE is a revolutionary new tool, established by the American Numismatic Society and the Institute for the Study of the Ancient World at New York University, to help in the identification, cataloging, and research of the rich and varied coinage of the Roman Empire. The project records every published type of Roman Imperial Coinage from Augustus in 31 BC, until the death of Zeno in AD 491. This is an easy to use digital corpus, with downloadable catalog entries, incorporating over 43,000 types of coins – already totalling over 100,000 physical specimens!
Start exploring Roman coins here: http://numismatics.org/ocre/results