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Amazon.com: NATIONAL GEOGRAPHIC Rocks and Minerals Education Set – 15-Piece Rock Collection Starter Kit with Tiger's Eye, Rose Quartz, Red Jasper, and More, Display Case and Identification Guide : Toys & Games
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National Geographic Starter Rock Tumbler Kit — Brainfuel Toys | Educational STEM Toys for Kids, Parents, & Teachers
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NATIONAL GEOGRAPHIC Rock Tumbler Refill - Mega Madagascar Gemstone Pack, 3 lb of Gemstones Including Rose Quartz, Jasper, Labradorite, & More, Tumbler Grit & Jewelry Settings - Walmart.com
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The National Geographic Magazine, Volume 60, Number 1 July 1931 | Gilbert Grosvenor, Joseph F. Rock, Ruth Alexander Nichols
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