Wickenburg AZ: Normount Technical Publications, 1971. Paperback. xiii, 205p., running text with numerous b&w illustrations. Illustrations show acoustic printouts, construction diagrams, mathematical tables, and photos of completed devices installed on various weapons. Softbound in 10x8 inch decorated wraps, covers a little toned and dusty, entirely clean within, a very good copy. Please note, not for screwdriver and ducktape amateurs but metalworkers and gunsmiths. The combat bookshelf.