http://pec.lib.wvu.edu/record/P27141952The Harker Pottery Company, oldest firm manufacturing earthenware in America, uses natural gas for firing. Journal article tearout from: [Columbia Gas System. <em>News & Views</em>, 17:1952:June)].Findley, Ira D.Harker Pottery Company (Chester, W. Va.)Pottery, American--West Virginia--Chester.14256