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A set of ten maps compiling geological and historical information on locations in northern California of forty minerals, including gold, silver, amazonite, beryl, carnelian, feldspar, garnet, quart...
A set of ten maps compiling geological and historical information on locations in northern California of forty minerals, including gold, silver, amazonite, beryl, carnelian, feldspar, garnet, quartz, tourmaline, and others.