The author, Captain W.E. Scarborough is a retired naval aviator with 1700 hours of PBY flight time. The book is an 11-by-8.25 inch 50-page paperback filled with photos, plan drawings, and detailed descriptions of the many variants of the Catalina flying boat, along with historical notes on their development, usage, and combat records. It's an excellent resource for the study and appreciation of the PBY, written first-hand by one of its pilots.