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The Reader of Rocks

In 1815 William Smith published the first detailed geological map of an entire country. Its scope was ambitiou

 

Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks

 

rock | Definition, Characteristics, Formation, Cycle ...

 

Amazon.com: rocks

 

Gemstones: Facts, photos, and information for over 100 gems.

 

List of Gemstones: Precious and Semi-Precious Stones - Gem ...

 

Gemstones List: Gemstone Names by Color and Type ...

Today's Quote...

“America is the greatest of opportunities and the worst of influences.”

George Santayana