The product is a handy engineering data handbook focusing on air and gas technology, written by author Hoffman. Published by Clarkson Enterprises in the United States, this 1st edition handbook is a valuable resource for engineering students and professionals. With 49 pages of informative content, this softcover handbook is a practical guide for understanding key concepts in the field of engineering. You are bidding on the item shown. It is used, and has light wear. I do not accept returns at this time, so please contact me with questions before purchase. See photos for condition. Thanks for shopping!