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Minerals by George Robinson
Microscopic identification of crystals by Richard E Stoiber
Optical mineralogy .. by Austin Flint Kerr Rogers, Paul F.
Gems and precious stones of North America; a popular description of their occurrence, value, history, archaeology, and of the collections in which they exist. Also a chapter on pearls and on remarkable foreign gems owned in the United States by George Frederick Kunz
MANUAL OF DETERMINATIVE MINERALOGY WITH AN INTRODUCTION OF BLOWPIPE ANALYSIS; REVISED AND ENLARGED SIXTEENTH EDITION by George J; Penfield Brush, Samuel L.
Mineralogy of the Black Hills by Willard Lincoln Roberts, and Rapp, George Robert
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