- Cărți electroniceThe Radio Boys on the Mexican BorderGerald Breckenridge
- Cărți electroniceThe Radio Boys Seek the Lost AtlantisGerald Breckenridge
- Cărți electroniceThe Radio Boys Rescue the Lost Alaska ExpeditionGerald Breckenridge
- Cărți electroniceThe Radio Boys with the Revenue GuardsGerald Breckenridge
- Cărți electroniceThe Radio Boys on Secret Service DutyGerald Breckenridge
- Cărți electroniceThe Radio Boys' Search for the Inca's TreasureGerald Breckenridge
- Cărți electroniceThe Radio Boys on Secret Service DutyGerald Breckenridge