55 books
The Boy Aviators on Secret Service
The Boy Scouts on the Range
The Dreadnought Boys on Battle Practice
The Boy Aviators' Polar Dash - Facing Death in the Antarctic
The Golden Galleon
The Ocean Wireless Boys and the Lost Liner
The Boy Scouts Under Fire in Mexico
The Boy Aviators' Treasure Quest; Or, the Golden Galleon
The Boy Aviators in Africa; Or, an Aerial Ivory Trail
The Boy Scouts at the Panama Canal
The Boy Scouts' Mountain Camp
The Boy Scouts at the Panama-Pacific Exposition
The Boy Aviators' Flight for a Fortune
The Boy Scouts at the Panama Canal - The Original Classic Edition
The Boy Scouts at the Panama-Pacific Exposition - The Original Classic Edition
The Boy Scouts' Mountain Camp - The Original Classic Edition
The Ocean Wireless Boys and the Lost Liner - The Original Classic Edition
The Boy Scouts for Uncle Sam
The Border Boys Across the Frontier
The Boy Aviators' Treasure Quest
The Boy Aviators' Polar Dash; Or, Facing Death in the Antarctic
The Boy Scouts of the Eagle Patrol
The Boy Aviators in Africa
The Boy Scouts on Belgian Battlefields