55 books
The Border Boys Across the Frontier(Dodo Press)
The Boy Aviators' Treasure Quest; Or, the Golden Galloen (Dodo Press)
The Boy Aviators' Polar Dash; Or, Facing Death in the Antarctic (Dodo Press)
Boy Aviators' Polar Dash, The: Or Facing Death in the Antarctic. Boy Aviators Series.
The Boy Aviators' Polar Dash
The Ocean Wireless Boys and the Naval Code
The Motor Rangers' Cloud Cruiser