DISCOVER JUST HOW LONG IT REALLY TAKES FOR A CAVE TO FORM

Maroo, a girl of the late Ice Age, must take charge after her father is killed, and lead her little brother, mother, and aged grandmother to the safety of the w

Ideal for today's young investigative reader, each A True Book includes lively sidebars, a glossary and index, plus a comprehensive "To Find Out More" section l

#1 NEW YORK TIMES BESTSELLER • In this, the extraordinary conclusion of the ice-age epic series, Earth’s Children®, Ayla, Jondalar, and their infant daught

Encyclopedia of Caves, Third Edition, provides detailed background information to anyone with a serious interest in caves. This includes students, both undergra