GAS MASKS AND CIVIL DEFENSE. By Richard L. Urie. This fully illustrated book is a practical and comprehensive guide that explains the basics of how gas masks work, what they protect from and what they don’t, how the units can fail, and standard use and care. Includes a quick reference guide to the types of biological, chemical and radiological threats and what protections are needed for each as well as a bonus chapter on other civil defense measures. A straightforward and common sense guide by an industry expert designed to give the general public an unbiased reference for understanding what a gas mask actually is and how to use it effectively. 72 pages, Published Nov. 2001.