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- Scooby-Doo! a subtraction mystery, the case of the disappearing doughnuts, by Mark Weakland ; illustrated by Scott Gross
- Weakland, Mark, Yogi Bear's guide to the great outdoors
- Yogi Bear's guide to animal tracks, by Mark Weakland ; illustrated by Christian Cornia ; consultant, Dr. John D. Krenz, Department of Biology, Minnesota State University, Mankato, Minnesota
- Scooby-Doo! and the truth behind mummies, by Mark Weakland ; illustrated by Scott Neely
- Weakland, Mark, Solve it with Scooby-Doo!
- Yogi Bear's guide to plants, by Mark Weakland ; illustrated by Christian Cornia
- Zombies and forces and motion, by Mark Weakland ; illustrated by Gervasio
- Scooby-Doo! a number comparisons mystery, the case of the lunchroom gobbler, by Mark Weakland ; illustrated by Scott Gross
- Scooby-Doo! an addition mystery, the case of the angry adder, by Mark Weakland ; illustrated by Scott Gross
- Thud!, Wile E. Coyote experiments with forces and motion, by Mark Weakland ; illustrated by Christian Cornia
- Scooby-Doo! an even or odd mystery, the case of the oddzilla, by Mark Weakland ; illustrated by Scott Gross
- Scooby-Doo! and the truth behind werewolves, by Mark Weakland ; illustrated by Dario Brizuela
- The lonely existence of asteroids and comets, by Mark Weakland ; illustrated by Carlos Aón
- Yogi Bear's guide to bugs, by Mark Weakland
- Scooby-Doo! and the truth behind vampires, by Mark Weakland ; illustrated by Christian Cornia
- Smash!, Wile E. Coyote experiments with simple machines, by Mark Weakland ; Illustrated by Christian Cornia
- Yogi Bear's guide to rocks, by Mark Weakland ; illustrated by Bryan Beach ; consultant, Russ Colson
- Onion juice, poop, and other surprising sources of alternative energy, by Mark Weakland
- Scooby-Doo! a subtraction mystery, the case of the disappearing doughnuts, by Mark Weakland ; illustrated by Scott Gross
- Scooby-Doo! an addition mystery, the case of the angry adder, by Mark Weakland ; illustrated by Scott Gross
- Yogi Bear's guide to animal tracks, by Mark Weakland ; illustrated by Christian Cornia ; consultant, Dr. John D. Krenz, Department of Biology, Minnesota State University, Mankato, Minnesota
- Scooby-Doo! and the truth behind mummies, by Mark Weakland ; illustrated by Scott Neely
- Yogi Bear's guide to plants, by Mark Weakland ; illustrated by Christian Cornia
- Scooby-Doo! a number comparisons mystery, the case of the lunchroom gobbler, by Mark Weakland ; illustrated by Scott Gross
- Thud!, Wile E. Coyote experiments with forces and motion, by Mark Weakland ; illustrated by Christian Cornia
- Scooby-Doo! an even or odd mystery, the case of the oddzilla, by Mark Weakland ; illustrated by Scott Gross
- Scooby-Doo! and the truth behind werewolves, by Mark Weakland ; illustrated by Dario Brizuela
- Yogi Bear's guide to bugs, by Mark Weakland
- Scooby-Doo! and the truth behind vampires, by Mark Weakland ; illustrated by Christian Cornia
- Smash!, Wile E. Coyote experiments with simple machines, by Mark Weakland ; Illustrated by Christian Cornia
- Yogi Bear's guide to rocks, by Mark Weakland ; illustrated by Bryan Beach ; consultant, Russ Colson