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

Tom Swift in the Caves of Ice, or, the Wreck of the Airship

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

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

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

The Call of the Beaver Patrol; Or, A Break in the Glacier

The Young Treasure Hunter; Or, Fred Stanley's Trip to Alaska

The Pony Rider Boys in Louisiana; or, Following the Game Trails in the Canebrake

The Pony Rider Boys on the Blue Ridge; or, A Lucky Find in the Carolina Mountains

Secret Mission to Alaska Sandy Steele Adventures #5

Sam Steele's Adventures on Land and Sea