An updated URL

Getting Started With Ancient Coins
http://coinsguide.reidgold.com/ancients.html

Brad's Introduction to Ancient Coins
http://myplace.frontier.com/~brads98/coins.html

Roman Coin Denominations
http://www.celatorsart.com/denominations.html

Celator's Art, Ancient Coins
http://www.celatorsart.com/

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"Guarded by a tired cohort of Roman Heavy Infantry"