How did Harriett Tubman escape slavery? Is LeBron James really the best basketball player of all time? How do tornadoes form? The 59 books in this nonfiction mega-list answer all these questions and more for curious young readers. Leveled at Guided Reading Levels S-V for more advanced readers, these titles cover a wide breadth of topics and feature expanded vocabulary, technical information, and more complex themes, and ask students to employ a wide range of reading strategies. They're ideal for building your nonfiction Guided Reading library and for using as students progress to proficient independent readers.