93 books • 8 series
Book #62: Sopwith Triplane Aces of World War 1
Book #63: Fokker D VII Aces of World War 1
Book #67: Sopwith Pup Aces of World War 1
Book #4: The Sopwith Dolphin in RFC, RNAS, RAF and Polish Service
Book #32: Albatros Aces of World War 1
Book #33: Nieuport Aces of World War 1
Book #40: Fokker Dr I Aces of World War 1
Book #42: American Aces of World War 1
Book #48: Dolphin and Snipe Aces of World War 1