Here's something interesting:
The original Celtic Coin Index at Oxford is organized by Celtic Coin Index number, a unique identification number indicating the year and order in which each specimen was catalogued. When Hooker & Perron built the Celtic Coin Index Online, we wanted the records to be easier to find, so we organized them within their own context. The coin records (within the broad divisions of British and Continental Celtic), are sorted Geographically by Region, then by Tribe within each region, then, in the British issues, by Van Arsdell numbers, which shows summaries of each coin, leading to individual detailed coin records. You can navigate through the records by tribe and type, or go to the search page, and look for any information of interest to you