Discover Series Books for Babies & Toddlers Get ready for some rough and tumble trucks! In this Discover Series title, 28 tractors, excavators, forklifts and more are featured in big, colorful photographs on white backgrounds. Used as a jumpstart for interaction, Discover Series Picture Books are a great way to introduce new images, words and concepts to kids. Use this photo dictionary as a learning tool. Each photo has a clear title beneath it for identification. Language learners, children, and people looking to build their vocabulary can use this simple book to learn new words.