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Follow the movement of minerals as they travel from Mexican mines to markets, museums, and private collections.
The definitive publication on the fascinating and beautiful Fairburn Agates of South Dakota.
An inside look at Montana's beautiful Dryhead agates.
An exciting journey through the history of life and the part our continent has played in it all.
This popular nontechnical introduction to meteorites, asteroids, comets, and impact craters is now even better!
The Connoisseur's Guide to Precious Gemstones.