This authoritative encyclopedia identifies thousands of marks from American, English and European potters of earthenware, ironstone, and stoneware. In addition, each entry offers a brief history of each pottery company and listings of further readings for those desiring to delve deeper into the history of each potter. Numerous appendices provide further information pertaining to ware types and printed patterns produced by the various potters, registry dates, and much more. This book will prove to be the essential reference for anyone interested in ceramics.