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Cally Hall

 
C H

About the Author

Cally Hall is a geology expert and an author of educational guidebooks that make the subject accessible to a variety of readers. She wrote her first book, a DK Smithsonian Handbook called Gemstones, in 1994. She has also written two science-themed books aimed at younger audiences, Closer Look at Mountains and Closer Look at Forests.

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Books by Cally Hall

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DK Smithsonian Handbook

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