Bell, Robert, John Whitmore and James Sweeney, Bell 's Unofficial Farthings: A Supplement, Published by Whitmore, Malvern, 1994, 237 pages, 43 plates, softcover. Contains new findings not in Bell 's original work, as well as a new numbering system for the entire series, rarity indices, and discussions of die pairings and other information for certain series of the coins, ex James Farr Collection Library.
Estimate: 20-30 USD