The Battleship Boys at Sea; Or, Two Apprentices in Uncle Sam's Navy

The Pony Rider Boys in the Grand Canyon / Or, The Mystery of Bright Angel Gulch

The Pony Rider Boys in the Alkali / or, Finding a Key to the Desert Maze

The Pony Rider Boys in the Ozarks / Or, the Secret of Ruby Mountain

The Pony Rider Boys with the Texas Rangers / Or, On the Trail of the Border Bandits

The Pony Rider Boys in Montana / Or, the Mystery of the Old Custer Trail

The Battleship Boys at Sea / Two Apprentices in Uncle Sam's Navy

The Pony Rider Boys in Texas / Or, The Veiled Riddle of the Plains

The Pony Rider Boys in Alaska / Or, The Gold Diggers of Taku Pass

The Pony Rider Boys in New Mexico / Or, the End of the Silver Trail

The Battleship Boys' First Step Upward / or, Winning Their Grades as Petty Officers