Have fun with faith using Route 66: A Trip through the 66 Books of the Bible for grades 2-5 In this 192-page book, children are part of the story as they embark on a road trip through each of the 66 books of the Bible. The lessons are divided into three 12-week units, are flexible enough to serve as stand-alone supplemental material, and cover each book's author, era, theme, and key verse.