6 books • 6 series
Gems of the World
Firefly Guide to Gems (Firefly Guides (Prebound))
Rocks and Minerals (Golden Photo Guide)
Deserts and Wastelands (Closer Look at)
Oceans - Pbk (Our Planet) (Our Planet (Troll Hardcover))
Gemstones (Collins Gem) (Rocks, Minerals and Gemstones)