AUTHENTIC from the PUBLISHER -The Pipe Fitters Blue Book, also known as “The Pipe Bible” is the most widely used and easy to understand book in the pipe trades today. W. V. “Duffy” Graves (author and publisher) created this easy to use and easy to understand complete reference guide with a doable water resistant cover for anyone in the pipe industry. This manual is clearly written and well illustrated. It includes essential information needed by instructors, students and workers in the field. NOTE: The Pipe Fitters Blue Book is allowed to use while taking the NCCER test.ebay shoppers BEWARE of COUNTERFEIT copies of The Pipe Fitters Blue Book being sold on ebay and Amazon. The counterfeit quality is extremely poor as well as the printed pages.We are the AUTHENTIC owners of this Book/Publication and legal COPYRIGHT holder. Thanks - Graves Publishing Company