The Heggerty Decodable Books Third Grade Series 1 Set of 12 books is a collection of phonics reader books designed specifically for third-grade students. Published by the Heggerty Library , these decodable books focus on reading skills and are written in English. With a series of decodable books, students can gradually build their reading abilities while learning phonics and sound-letter relationships. This set is perfect for elementary school students in the United States looking to improve their reading skills through engaging and educational materials.