Nancy Allen 
Underground Railroad [PDF ebook] 

While reading The Underground Railroad, students will learn about the network of secret routes and safe houses used by slaves to reach freedom. This 32-page title uses a variety of teaching components to help young readers strengthen their reading comprehension skills. The Symbols of Freedom series will allow students to explain events or concepts in a historical, scientific, or technical text, using language that pertains to time, sequence, and cause versus effect. Each title features photographs, maps, and informational sidebars that work with a Show What You Know section to help readers build their understanding of the topic.