Books in The radio boys series series

The Radio Boys (II) were created by Gerald Breckenridge and appeared in the ten book "Radio Boys Series," which ran from 1922 to 1931, beginning with The Radio Boys on the Mexican Border. The Boys (II) had an entirely more exciting set of adventures than the Radio Boys (I); The Boys (II) fought bandits on the Mexican border, worked for the Secret Service tracking down counterfeiters, went looking for lost Incan treasure in the Andes, helped rescue a lost Alaskan expedition, tramped through the jungles of the Congo, sought and found Lost Atlantis, acted as mercenaries in Central America, and worked with America's "Air Patrol." The Radio Boys II Series: 1. The Radio Boys On The Mexican Border - (Hardcover, 1922) 2. The Radio Boys On Secret Service Duty - (Hardcover, 1922) 3. The Radio Boys With The Revenue Guards - (Hardcover, 1922) 4. The Radio Boys Search For The Inca's Treasure - (Hardcover, 1922) 5. The Radio Boys Rescue The Lost Alaskan Expedition - (Hardcover, 1922) 6. The Radio Boys In Darkest Africa - (Hardcover, 1923) 7. The Radio Boys Seek The Lost Atlantis - (Hardcover, 1923) 8. The Radio Boys With The Border Patrol - (Hardcover, 1924) 9. The Radio Boys As Soldiers Of Fortune - (Hardcover, 1925) 10. The Radio Boys With The Air Patrol - (Hardcover, 1931)