3 books • 1 series
The U.S. Air Service in World War I - The Final Report and A Tactical History - Stories About the Sopwith Camel, Haviland, Eddie Rickenbacker, Observation Balloons, Pursuit Tactics, and Spad Planes
The U.S. Air Service in World War I - Volume 1 The Final Report and a Tactical History
Air Force Combat Units of World War II (Reference)