The Blue Book of Fitter’s Welder’s Pattern and Layout Manual by H. G. Thorsness is a comprehensive reference book for welders, focusing on practical techniques and guidelines for welding and pipe fitters work. Published in 1997 in the United States, this manual is the 11th printing from 1997 authored by H.G. Thorsness covers a range of welding subjects in a clear and informative manner. With a specific emphasis on welding patterns and layout, this manual serves as a valuable resource for professionals and enthusiasts in the field of welding. Book has light wear and is in very good condition.