16 books
The Dreadnought Boys Aboard a Destroyer
The Boy Aviators in Record Flight
The Dreadnought Boys' World Cruise
The Dreadnought Boys in Home Waters
The Golden Galleon
The Boy Aviators in Africa; Or, an Aerial Ivory Trail (Dodo Press)
The Ocean Wireless Boys and the Naval Code(Dodo Press)
Boy Aviators' Polar Dash
The Boy Aviators' Treasure Quest
The Boy Aviators in Africa
The Boy Aviators' Treasure Quest, or the Golden Galleon
The Boy Aviators' Polar Dash, or Facing Death in the Antarctic
The Boy Aviators in Africa or an Aerial Ivory Trail
The Ocean Wireless Boys and the Lost Liner
The Dreadnought Boys on Aero Service
The Dreadnought Boys On Battle Practice