44 books • 11 series
Appaloosa Horses (Horse Crazy)
Space Robots (World of Robots)
Flying Robots (World of Robots)
Factory Robots (World of Robots)
Medical Robots (World of Robots)
Military Robots (World of Robots)
Police Robots (World of Robots)
German Shepherds (Doggie Data)
Pugs (Doggie Data)
Poodles (Doggie Data)
Labrador Retrievers (Doggie Data)
Ghosts (Strangebut True?) (Strange . . . But True?)
The Bermuda Triangle (Strangebut True?) (Strange . . . But True?)
Bigfoot (Strangebut True?) (Strange . . . But True?)
Haunted Places (Strange . . . But True?) (Strangebut True?)
Mixed Martial Artists (Rank It!)
ESP (Strange . . . But True?) (Strangebut True?)
Special Ops Forces (Rank It!)
UFOs (Strange . . . But True?) (Strangebut True?)
I Wish You Were Dead!