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Blakemore, Kenneth,. Snuff Boxes, published by Frederick Muller Ltd, London 1976, dustwrapper; Eric Delieb and Michael Roberts, The Great Silver Manufactory, Matthew Boulton & the Birmingham Silversmiths 1760 - 1790, Sudio Vista 1971, dust wrapper and also by Delieb, Investing in Antique Silver, Barrie & Rockliff, 1967, (water damaged). (3)