Appropriately challenging students as they progress from developing to proficient readers is key to building skilled, successful readers. These Guided Reading Levels O-P titles offer a huge range of engaging nonfiction subjects with just the right mix of difficulty while still ensuring reading success. With longer texts and more sophisticated subject matter, these biographies, historical accounts, and fact-filled books will build both reading skills and curious learners. They're just right for building your nonfiction Guided Reading library and confident readers!