THE MOTOR BOYS IN THE CLOUDS, or A Trip for Fame and Fortune
THE MOTOR BOYS OVER THE ROCKIES, or A Mystery of the Air
THE MOTOR BOYS OVER THE OCEAN, or A Marvelous Rescue in Mid-Air
THE MOTOR BOYS ON THE WING, or Seeking the Airship Treasure
THE MOTOR BOYS AFTER A FORTUNE, or The Hut on Snake Island
THE MOTOR BOYS ON THE BORDER, or Sixty Nuggets of Gold
THE MOTOR BOYS UNDER THE SEA, or From Airship to Submarine
THE MOTOR BOYS ON ROAD AND RIVER, or Racing to Save a Life
THE MOTOR BOYS AT BOXWOOD HALL, or Ned, Bob and Jerry as Freshmen
THE MOTOR BOYS ON A RANCH, or Ned, Bob and Jerry Among the Cowboys