Steven M. Hoffman
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Weathering and Erosion: Wearing Down Rocks (Rock It! (Paperback))
Hoffman, Steven M
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Gems, Crystals, and Precious Rocks (Rock It!)
Hoffman, Steven M; Hoffman, Stephanie
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Rock Study: A Guide to Looking at Rocks (Rock It!)
Hoffman, Steven M.
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Volcanoes and Earthquakes: Making and Moving Rock (Rock It!)
Hoffman, Steven M.
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