71 books • 12 series
Book #1: The Gnomes of Hartland
Book #1: The Knick-Knack Man
Book #4: Paradox
Book #1: The Nerdy Dozen
Book #1: The Nerdy Dozen #1
Book #2: The Nerdy Dozen #2
Book #2: Close Encounters of the Nerd Kind
Book #3: The Nerdy Dozen #3