Смарагд — разлика између измена

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== Литература ==
* {{cite book|author=Cooper, J.C. (Ed.) |title=Brewer's Myth and Legend|location=New York|publisher=Cassell Publishers Ltd|year=1992|id=ISBN 0-304-34084-7|pages=}}
* {{cite book|last=Sinkankas, |first=John . ''|title=Emerald & Other Beryls''. |location=|publisher=Geoscience Press. . {{page|year=1994|id=ISBN 0-8019-7114-4|pages=}}
* {{cite book|author=Hurlbut, Cornelius S.; Klein, Cornelis (1985). ''|title=Manual of Mineralogy'' |location=(20th ed.). New York: |publisher=John Wiley and Sons. {{page|year=1985|id=ISBN 0-471-80580-7|pages=}}
* Weinstein, Michael (1958). ''The World of Jewel Stones''. Sheriden House.
* Nassau,{{cite book|last=Nassau|first=Kurt (1980). ''|title=Gems made by man''. |location=|publisher=Gemological Institute of America. {{page|year=1980|id=ISBN 0-87311-016-1|pages=}}
* [http://www.gemecology.org Ali, Saleem H. (2006). The Emerald City: Gemstone mining in Brazil]
* [http://www.casmsite.org World Bank: CASM Initiative]
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