Here is a list of resources that I use often.

• ACSearch
• CNG Research page
• OCRE
• RPC Online
• VCoins
• Wildwinds
• Magna Graecia Coins
• RIC Online
• Crawford Online
• Roman Coins Database
• Andrew McCabe (RR)
• Forvm Ancient Coins
• MA-Shops
• Dattari, Monete imperiali greche. Numi Augg. Alexandrini (catalog, plates)
• BMC Alexandria
• Tesorillo
• Helvetica
• Maravedis
• Augustus Coins (Warren Esty)