W.B.C.C.
Online site of the Worldwide Bi-metallic Collectors Club, created to pool information about this type of coin. Includes catalogue, an image gallery, and all the club's newsletters.
Ancient to Early Medieval Bi-metallics
A quick review of early bi-metallic coinage.
Joel Anderson: World coins
An offering of world coins and paper money and associated catalogs. Interesting list of bi-metallic coins for sale, with some scans.
Bi-metallics Coins, Tokens
Includes articles on the subject, and some images.
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