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NOVA Treasures of the Earth: Gemstones Video Worksheet by Jolanda Blackwell
NOVA: Treasures of the Earth DVD | Shop.PBS.org
PBS NOVA Treasures of the Earth: Metals Worksheet and Answer Sheet
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PBS NOVA Treasures of the Earth: Metals Worksheet and Answer Sheet
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NOVA - Official Website | Treasures of the Earth
Treasures of the Earth: Gems | NOVA | PBS
