1983 Highly illustrated. Gives much valuable information on the hollow earth, hollow earth societies, early hollow earth pioneers or "In-Earthologists".

Let your child take an exciting, visual journey from Earth's core to the edge of the outer atmosphere! Explore the elements that make up the soil, the sea, and

Did you know that astronomers have classified the planets as inner, outer and outermost? This book discusses the planetary arrangements. It also discusses a few