Monsters 9 Children's songs, English 7 Friendship 7 History 6 Evolution (Biology) 4 Business logistics 3 Clothing trade 3 Earth (Planet) 3 Labor and globalization 3 Life 3 Origin 3 Work 3 Children's stories 2 Children's stories, English 2 Conduct of life 2 Conservation of natural resources 2 Dragons 2 Indians of North America 2 Mother and child 2 Pollution 2 Water 2 Animals 1 Braille books 1 Children's encyclopedias and dictionaries 1 Chinese fiction 1 Criticism and interpretation 1 Earth sciences 1 Environmental disasters 1 Extinction (Biology) 1 Homes and haunts 1