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Are you Walter Schumann, author of the books below?
Gemstones of the World by Walter Schumann Handbook of Rocks, Minerals, and Gemstones by Walter Schumann Minerals of the World by Walter Schumann Collins Photo Guide to Rocks, Minerals and Gemstones by Walter Schumann Gemas do Mundo by Walter Schumann Guide des Pierres Précieuses by Walter Schumann Mineralien, Gesteine by Walter Schumann Steine und Mineralien by Walter Schumann Gemstones of the World by Walter Schumann ROCAS Y MINERALES by Walter Schumann


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