Naval Aces of WWI Part 1 and/or Part 2. Author Jon Guttman.
Perhaps contrary to popular belief, the Royal Naval Air Service played a considerable part in actions on the Western front and were ahead of their RFC counterparts in the use of the Sopwith Pup, Triplane and Camel. This book contains a wealth of information and illustrations about the men and the planes that made a mark in the conflict.
Part 2 A fascinating insight into the Naval pilot aces and their aircraft from both sides of the conflict. Unusually, this was a period when flying boats and seaplanes were often in the thick of the action, so this book delves down paths that are not well trodden.