This set includes 6 copies of each title/reading level, 192 books total, plus FREE Teacher's Guide ABOUT LADDERS READING/LANGUAGE ARTS: The Ladders Reading/Language Arts listed here are Common Core versions. This series covers all Reading and Writing Common Core Standards for grades 3-5. Non-Common Core, as well as Texas, editions are also available. For more information please contact your sales rep. Same Great Content. Four Different Reading Levels. Laddered approach to leveled readers in order to differentiate for a shared experience. Compelling selections utilizing National Geographic visuals. 1 % coverage of Common Core Standards for Reading Literature, Reading Informational Text, and Writing. Expertise of program consultant, Stephanie Harvey.