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Are you Dietmar Schwarz, author of the books below?
Geographic Origin Determination of Colored Gemstones - 世界主要彩色... by Dietmar Schwarz Esmeraldas Inclusões em Gemas by Dietmar Schwarz Emerald Modern Gemmology by Dietmar Schwarz Modern Gemmology by Dietmar Schwarz Vegetable Grafting by Giuseppe Colla Achieving sustainable cultivation of vegetables by George Hochmuth Achieving sustainable cultivation of vegetables by Prof. George Hochmuth


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