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Amazon.com: Rocks, Gems, and Minerals of the Rocky Mountains (Falcon Pocket Guides) eBook : Romaine, Garret: Kindle Store
Rocks, Gems, and Minerals of the Rocky Mountains, 2nd Edition - 9781493046843
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Falcon Pocket Guide: Rocks, Gems, and Minerals of the Rocky Mountains (Falcon Pocket Guides): Romaine, Garret: 9780762784752: Amazon.com: Books
What's that Rock, Mineral, or Gem?: 9781465415929 - Christianbook.com
Rocks - Geology (U.S. National Park Service)
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