Description Readers practice decoding words with r-blends while exploring different types of machines used for construction projects. Bulldozers dig dirt. Dump trucks carry loads of dirt in their beds. Other machines drill holes and carry logs. Beginning readers hone their phonics skills while learning all about machines that help people build. As readers practice decoding words with r-blends, they gain practical knowledge. Every Stairway Decodables nonfiction book combines multiple aspects of the Science of Reading to support small group instruction, independent reading, and reading practice at home.