Leveled Readers for American Children English is created by McGraw-Hill Education Publishing Group, a publishing giant selected as "California Textbook", and has more attention than California textbook. The works of famous children's picture books and encyclopedia writers in the United States and Europe are compiled together. The content is novel and simple, close to children's life. Each level of books is divided into popular science stories, humanities stories, picture book stories and stage plays (the old version is story + popular science), covering all kinds of story types that children like. This is the authentic way of children's English reading in America. There are 3 levels in this set of books, and 15 books in each level.