The Radio Boys in Darkest Africa — Gerald Breckenridge
The Radio Boys on Secret Service Duty — Gerald Breckenridge
The Radio Boys Rescue the Lost Alaska Expedition — Gerald Breckenridge
The Radio Boys' Search for the Inca's Treasure — Gerald Breckenridge
The Radio Boys Seek the Lost Atlantis — Gerald Breckenridge
The Radio Boys with the Border Patrol — Gerald Breckenridge
The Radio Boys with the Revenue Guards — Gerald Breckenridge
