Build literacy skills and social studies content knowledge with the Early The Primary Source Readers series will ignite students' interest in history through the use of intriguing primary sources. This nonfiction reader features purposefully leveled text to increase comprehension for different learner types. Early Explorers teaches students about the fascinating explorers who mapped the world including the Vikings, Marco Polo, and Christopher Columbus. Text features include captions, a glossary, and an index to help build academic vocabulary and increase reading comprehension and literacy. This book prepares students for college and career readiness and aligns with state standards including NCSS/C3, McREL, and WIDA/TESOL.