From amphibians to trilobites, this authoritative guide provides a fascinating insight into the origin, formation, and remarkable variety of fossils. <br><br> Back by popular demand, this series of information books for children ages 8 and over are the same handy size with a fresh new design. All the facts kids need to know about natural history, science, and history topics are in these information-packed little books. Also included are reference books everyone can use-dictionaries in English and Spanish, encyclopedias in key areas, a thesaurus, and a spelling dictionary.