This series was conceived as a means for providing the American people with reliable, yet non-technical information about the agencies and instruments charged with their defense. The authors of each volume have been selected with an eye both to their right to speak as experts in their fields and to their capacity to present their subject interestingly. Though there is naturally some diversity in the approach and style of the various authors, the series as a whole maintains a high standard of readability. Each volume is illustrated with numerous sketches. Two of the books, those by Messrs. Baldwin and Ford, already appear in revised editions. The volumes forming part of this series are as follows: "The Army," by Harvey S. Ford (1941, 253 p.); "The Navy," by Hanson W. Baldwin (1941, 219 p.); "The Coast Guard," by Hickman Powell (1941, 194 p.); "The Marines," by Captain John H. Craige (1941, 211 p.); "The Air Forces," by Lt. Col. Harold E. Hartney (1942, 226 p.); "The Army Engineers," by Lt. Col. Paul W. Thompson (1942, 210 p.); "Our Arms and Weapons," by Major James E. Hicks (1941, 252 p.); "The Merchant Marine," by Carl D. Lane (1941, 201 p.); "Civilian Defense," by Walter D. Binger and Hilton H. Railey (1942, 200 p.); "Modern War," by Fletcher Pratt (1942, 184 p.).