39 books • 7 series
Oceans (Habitats)
Mountains (Habitats)
Wetlands (Habitats)
Grasslands (Habitats)
Forests (Habitats)
Rivers and Streams (Habitats)
Deserts (Buddy Book) (Habitats)
Lakes and Ponds (Habitats)
Moths (Bugs, Bugs, Bugs!)
Bumble Bees (Bugs, Bugs, Bugs!)
Butterflies (Bugs, Bugs, Bugs!)
Walkingsticks (Bugs, Bugs, Bugs!)
Parrots (Wild World of Animals) (First Facts: Birds)
Badgers (Wild World of Animals)
The Ivory Comb