Readers will follow the mail as it goes through the post office and processing plant, where its prepared for the rest of its journey. The informative text and accompanying photographs in this book bring readers along for the incredible trip. A concluding diagram helps readers summarize what theyve read using fun and colorful images.Readers will follow the mail as it goes through the post office and processing plant, where its prepared for the rest of its journey. The informative text and accompanying photographs in this book bring readers along for the incredible trip. A concluding diagram helps readers summarize what theyve read using fun and colorful images.