History 149 Friendship 67 Families 55 African Americans 38 Dogs 34 Cooking 33 Schools 33 Magic 32 Animals 29 Murder 28 World War, 1939-1945 26 Investigation 23 Survival 23 Brothers and sisters 21 Sisters 20 Quick and easy cooking 19 Race relations 18 Birds 16 Nutrition 16 Orphans 15 Baking 14 Conduct of life 14 Interpersonal relations 14 Monsters 14 Social aspects 14 Best friends 13 Cats 13 Fathers and daughters 13 Missing persons 13 Robots 12