The Reasearch Guides are a collection of reference books written to take the reader into further depth on topics in the fiction books of the Magic Tree House series. The first eight books were written by Mary Pope Osborne and Will Osborne. The rest were written by Mary and Natalie Pope Boyce. They were all illustrated by Sal Murdocca.
Please note that they were renamed Fact Trackers.
List of Research Guides
- Dinosaurs
- Knights and Castles
- Mummies and Pyramids
- Pirates
- Rain Forests
- Space
- Titanic
- Twisters and Other Terrible Storms
- Dolphins and Sharks
- Ancient Greece and the Olympics
- American Revolution
- Sabertooths and the Ice Age
- Pilgrims
- Ancient Rome and Pompeii
- Tsunamis and Other Natural Disasters
- Polar Bears and the Arctic
- Sea Monsters
- Penguins and Antarctica
- Leonardo da Vinci
- Ghosts
- Leprechauns and Irish Folklore
- Rags and Riches: Kids in the Time of Charles Dickens
- Snakes and Other Reptiles
- Dog Heroes
- Abraham Lincoln
- Pandas and Other Endangered Species
- Horse Heroes
- Heroes for All Times
- Soccer
- Ninjas and Samurai
- China: Land of the Emperor's Great Wall
- Sharks and Other Predators
- Vikings
- Dogsledding and Extreme Sports
- Dragons and Mythical Creatures
- World War II
- Baseball
- Wild West