5 results on '"H. Albert Gilg"'
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2. Synthetic Star Sapphires and Rubies Produced by Wiede's Carbidwerk, Freyung, Germany
3. Synthetic Emeralds Grown by Richard Nacken in the Mid-1920s
4. Chrysoberyl Recovered with Sapphires in the New England Placer Deposits, New South Wales, Australia
5. Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and Historial Account
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