The case of the missing monkeys
Monkeys
Jenny Cooper
Susan Minot
The Case of the Mythical Monkeys
Erle Stanley Gardner
The Masked Monkey
Franklin W. Dixon
Danger at the Zoo
Kathleen Ernst
Mystery of the lost dogs
Carolyn Keene
Little Monkey Lost
Keith DuQuette
Where Are the Children Now?
Alafair Burke
The Zoo Crew
The Case of the Disappearing Dinosaur
James Preller