Books in Children's Book Series (sorted alphabetically)
- Rover Boys on the Farm; or, Last Days at Putnam Hall Edward Stratemeyer
- Rover Boys on the Great Lakes; Or, The Secret of the Island Cave Edward Stratemeyer
- Rover Boys on the Ocean; Or, A chase for a fortune Edward Stratemeyer
- Rover Boys on the River; Or, The Search for the Missing Houseboat Edward Stratemeyer
- Rover Boys on Treasure Isle; or, The Strange Cruise of the Steam Yacht Edward Stratemeyer
- Rover Boys on Treasure Isle; Or, The Strange Cruise of the Steam Yacht Edward Stratemeyer
- Rover Boys out West; Or, The Search for a Lost Mine Edward Stratemeyer
- Rover Boys Under Canvas; Or, The Mystery of the Wrecked Submarine Edward Stratemeyer
- Roy Blakeley: His Story Percy Keese Fitzhugh
- Roy Blakeley, Pathfinder Percy Keese Fitzhugh
- Roy Blakeley's Adventures in Camp Percy Keese Fitzhugh
- Ruth Fielding and the Gypsies; Or, The Missing Pearl Necklace Alice B. Emerson
- Ruth Fielding at Snow Camp; Or, Lost in the Backwoods Alice B. Emerson
- Ruth Fielding at the War Front; or, The Hunt for the Lost Soldier Alice B. Emerson
- Ruth Fielding Down East; Or, The Hermit of Beach Plum Point Alice B. Emerson
- Ruth Fielding in Moving Pictures; Or, Helping the Dormitory Fund Alice B. Emerson
- Ruth Fielding in the Great Northwest; Or, The Indian Girl Star of the Movies Alice B. Emerson
- Ruth Fielding of the Red Mill; Or, Jasper Parloe's Secret Alice B. Emerson
- Ruth Fielding on Cliff Island; Or, The Old Hunter's Treasure Box Alice B. Emerson
- Ruth Fielding on the St. Lawrence; Or, The Queer Old Man of the Thousand Islands Alice B. Emerson
- Saddle Boys in the Grand Canyon; or, The Hermit of the Cave Captain James Carson
- Saddle Boys of the Rockies; Or, Lost on Thunder Mountain Captain James Carson
- Scientific American Boy; Or, The Camp at Willow Clump Island A. Russell Bond
- Scotch Twins Lucy Fitch Perkins
- Six little Bunkers at Aunt Jo's Laura Lee Hope