Title: Must-have for enthusiasts and reference
Review: Good: maximum information, well-organized, well-written (easy to read and concise), great picturesBad: not for mobile use (paperback version would be better/lighter)I am a rock/gem/mineral/metal enthusiast, and this is the best reference book I have found. I may get the paperback version because the hardcover version is too heavy to take with me to museums.
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