Suggested Collateral Reading Material
Books on Rocks and Minerals
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.