384 books • 89 series
Book #1: All Year Round
Book #2: Rivers
Book #3: Nature Gardens
Book #4: Weather
Book #3: The Animal Kingdom
Book #5: Light
Book #6: Plants
Book #1: Air
Book #2: Everyday Chemicals
Book #2: Anger
Book #3: Jealous
Book #4: Worried
Book #5: Feeling - Shy
Book #2: Plains and Indians
Book #4: Greeks