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.
Fossils
The Common Fossils of Missouri, by A. G. Unklesbay, Missouri Handbook No. 4.
Magazines on Rocks, Minerals, and Fossils
Rocks and Minerals, Box, 29, Peekskill, N.Y.
Gems and Minerals, P.O. Box 687, Mentone, Calif.
The Mineralogist, P.O. Box 808, Mentone, Calif.
American Mineralogist, technical official publication of the American Mineralogical Society, Ann Arbor, Michigan, editorial office, Dept. of Mineralogy, University of Michigan.