Trade Books: Reading aloud every day is necessary for a strong early literacy curriculum. Each Place Unit includes three high-quality, engaging Trade Books that introduce children to a variety of genres, from alphabet books to fiction and nonfiction. Authors include Leo Lionni and Julie Sykes. The books revolve around the "place" and help children build vocabulary and the concepts that they learned about in the PlaceBook. The Place Unit gives you guidance on how to encourage children to discover new aspects to the book with each reading and rereading.