Walter and the Wireless

The Radio Boys' First Wireless; Or, Winning the Ferberton Prize

The Radio Boys on the Mexican Border

The Radio Boys Rescue the Lost Alaska Expedition

The Radio Boys on Secret Service Duty

The Radio Detectives in the Jungle

The Radio Boys Under the Sea; or, The Hunt for Sunken Treasure

The Radio Boys with the Border Patrol

The Radio Girls at Forest Lodge; or, The Strange Hut in the Swamp

Radio Boys in the Flying Service; or, Held For Ransom by Mexican Bandits

The Radio Boys with the Iceberg Patrol; Or, Making safe the ocean lanes