Bibliography Fenton Glass the First Twenty Five Years, by William Heacock Fenton Art Glass Identification and Value Guide, by Margaret & Ken Whitmyer Dugan/Diamond, The Story of Indiana, PA Glass, by William Heacock, James Measell and Berry Wiggins Wheeling Glass, Collection of the Oglebay Institute Glass Museum, by Gary E. Baker, G. Eason Eige, Holly Hover McCluskey, Jane Shadel Spillman, Kenneth M. Wilson Harry Northwood the Early Years, by William Heacock, James Measell, Berry Wiggins Harry Northwood the Wheeling Years, by William Heacock, James Measell, Berry Wiggins Encyclopedia of Colored Pattern Glass Book 5, by William Heacock, Fred Bickenheuser Encyclopedia of Victorian Colored Pattern Glass Book 6, by William Heacock Old Pattern Glass, by William Heacock Encyclopedia of Victorian Colored Pattern Glass Book II, Opalescent Glass from A to Z by William Heacock Encyclopedia of Victorian Colored Pattern Glass Book III, by William Heacock Encyclopedia of Victorian Colored Pattern Glass Book 9, by William Heacock Books One through Ten of Carnival Glass Patters by Marion T. Hartung Decorative Victorian Glass, by Cyril Manley Sowerby Gateshead Glass, by Tyne and Wear Museums Service Collectibe Glass Books 1, 2, and 4, by Theodore C. and Viola V. Lagerberg