Groundbreaking Reads: Caves

Explore the wonders and hazards of caving, covering the Greenland's caves, the underwater realm of the jungles of teh Yucatan and the wild caves of the American Southwest.

Lush photos of specimens and discussion of historical jewels.

Written by a parent, for parents, this opinionated, personal, and easy-to-use guide has hundreds of ideas to keep the kids entertained for an hour; a day, or a weekend!

The most complete reference book ever published on the subject. All the gemstones ever discovered are treated in their many variations. More than 1,500 full-color photos showcase each precious and semiprecious stone .

Gems, minerals, and objets d'art from the American Museum of Natural History.