http://www.archive.org/stream/epigraphiccommen00rosbuoft#page/n1/mode/2upThis book although from the 1920 is invaluable if you are looking for archaeological evidence with a primary focus on extant inscriptions from the book on Gaius
Caligula from the author Gaius Tranqullius Suetonius. I found it interesting to dig up any inscriptions for
Caligula or CCAESAR on inscriptions from the
Julio Claudian epigraphy or inscriptions. Coins have plenty of inscriptions, but the marble or
stone inscriptions are
rare. If you want to know more or are looking for something specific, I may be able to
help you find an image from the Caligulan period.
Joe Geranio
Julio Claudian Iconographic Association
http://groups.yahoo.com/group/julioclaudian/ Joe Geranio
JCIA