Richard M. Pearl

Colorado Gem Trails: And Mineral Guide

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Gems Minerals Crystals and Ores

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Successful Mineral Collecting and Prospecting

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Handbook for Prospectors

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Colorado Gem Trails and Mineral Guide

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1001 Questions Answered About the Mineral Kingdom

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How to Know the Minerals and Rocks

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Gems, Minerals, Cystals and Ores: The Collector's Encyclopedia

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Colorado Rocks, Minerals, Fossils

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Exploring Rocks, Minerals, Fossils in Colorado

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Colorado Gem Trails and Mineral Guide

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Geology, Richard M. Pearl, Third Edition

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Geology

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An Alternative Future for America II: Essays and Speeches

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Rocks and Minerals

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Principles of Geology (Coll. Outline S)

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1001 Questions Answered About the Mineral Kingdom, Illustrated with Photographs and Drawings

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Successful Mineral Collecting and Prospecting

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Wonders of Rocks and Minerals

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1001 Questions Answered about Earth Science

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Popular Gemology

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Faceted Gems - A Historical Article on the Methods and Equipment Used in Lapidary

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Popular Gemology

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Colorado Gem Trails and Mineral Guide

Richard M. Pearl

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1001 Questions Answered About Earth Science

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Landforms of Colorado

Richard M. Pearl

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