The Usborne Illustrated Dictionary of Science.
The Kingfisher Science Encyclopedia (Kingfisher Encyclopedias)
DK Eyewitness Books: Human Body: Explore How the Human Body Works from the Smallest Cells to the Systems That Keep Us Alive
Science Encyclopedia
Encyclopedia of Animals
Janice VanCleave's Biology For Every Kid: 101 Easy Experiments That Really Work
Janice VanCleave's Science Around the World: Activities on Biomes from Pole to Pole
Encyclopedia of Science
The Kingfisher History Encyclopedia (Kingfisher Encyclopedias)