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- HörbuchThe Microscopic Snot DebacleKen Bowser
- HörbuchThe Secret in the Jelly Bean JarKen Bowser
- HörbuchThe Hint in the Peeping PupilKen Bowser
- HörbuchThe Question of the Vomit VortexKen Bowser
- HörbuchThe Conundrum of the Crooked CrayonKen Bowser
- HörbuchThe Vexing Hectare DetectorKen Bowser
- HörbuchThe Clue in the Painted PatternKen Bowser
- HörbuchThe Mighty Lever EndeavorKen Bowser
- HörbuchSerien: Jesse Steam MysteriesKen Bowser
- HörbuchThe Riddle of the Spinning Sycamore SeedKen Bowser