113 books • 14 series
Clocks and Rhythms (Science Concepts Second)
Snakes and Such (What a Pet!)
Pet or Not (What a Pet) (What a Pet!)
AIDS
Allergies (My Health) (My Health (Pb))
Energy (Science Concepts Second) (Science Concepts)
Plate Tectonics (Science Concepts Second)
Weather and Climate (Science Concepts Second)
The Grizzly Bear (Endangered in America)
Photosynthesis (Science Concepts Second)
The California Condor (Endangered in America)
Evolution (Science Concepts Second)
Food Chains (Science Concepts Second)
The Florida Panther (Endangered in America)
The Manatee (Endangered in America)
The Black-Footed Ferret (Endangered in America)
Spotted Owl (Endangered in America)