Green Building Press brings you this guide to making a much better concrete with as little damage to the environment as possible by assisting you in building eco-friendly structures With mixing ratios and instructions and the how to's for pouring a slab, creating forms and giving you sample mix designs, this book is a must have for the builders library. Soft cover, 8+"x11", 53 pages, many black and white illustrations and charts. Free Shipping! To order by phone call Toll Free 866-596-9982