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A geology expert explains how to tell rocks from minerals and then shares secrets of spotting sulfides, chromates, igneous and metamorphic rocks, and more. More
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DK's Smithsonian Handbook of Gemstones is packed with more than 800 vivid full-color photographs of more than 130 varieties of cut and uncut stones, organic gemstones, and ... More
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Featuring an extra-sturdy library binding! For 4,600 million years, there has been some form of life on Earth. At first, the Earth was a mass of raging fires and volcanoes, so ... More
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Arshile Gorky (c. 1904 1948) was one of the central figures in American art s shift toward abstraction during the first half of the 20th century. Accompanying the first major ... More
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Learn how to make free phone calls to more than 75 million people, and dirt-cheap phone calls to practically everyone else, anywhere on Earth! You can do it with Skype. This ... More
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This report examines the supply of and demand for pilots and addresses the questions of whether future shortages will become widespread, not confined to just one military ... More
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