60 books • 1 series
Boy Scouts in a Motor Boat or Adventures on the Columbia River
Boy Scouts on the Open Plain
Boy Scouts in Death Valley
Boy Scouts in Southern Waters; Or, Spaniard's Treasure Chest
Boy Scouts on Motorcycles or With the Flying Squadron
Boy Scouts on Motorcycles
Boy Scouts in an Airship (Boy Scouts, #11)
The Boy Scout Camera Club (Boy Scouts, #9)
Boy Scouts in an Airship; Or, the Warning from the Sky
Boy Scouts in Mexico; Or, On Guard with Uncle Sam
Boy Scouts in a Submarine
Boy Scouts in Mexico