Spanish version of the Pipe Fitter's Blue Book by W.V. Graves. 

Commonly referred to as the Pipe Bible, this is the most widely used book in the trade today. It contains illustrations such as solving rolling offsets, centers of 15-degree, 22-1/2-degree and 60-degree butt weld elbows cut from a 90-degree elbow. It also contains diagrams for a true Y layout, common pipe angles and their solutions, special offsets and solutions, mitered pipe cuts, multi-piece mitered turns and much more.