How to Know the Minerals and Rocks, by Pearl; publisher, McGraw-Hill
Book Co., New York.
A Field Guide to Rocks and Minerals, by Pough; publisher, Houghton,
Mifflin Co., Boston.
Gemstones and Minerals: How and Where To Find Them, by Sinkankas;
publisher, Van Nostrand, Princeton, New Jersey.
Look for paper back editions of these and other books which may be
widely available.