The GA-600-15: Gypsum Fire Resistance Design Manual, 21st Edition is a comprehensive guide written by the Gypsum Association specifically for designers working with gypsum products. This paperback book, released in 2015, provides detailed information and guidance on how to incorporate gypsum materials into fire-resistant designs. With a focus on design and written in English, this manual is a valuable resource for professionals looking to enhance the fire resistance of their projects using gypsum products.