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* [httphttps://wwwweb.archive.org/web/20130610151056/http://gemecology.org/ Ali, Saleem H. (2006). The Emerald City: Gemstone mining in Brazil]
* [httphttps://wwwweb.archive.org/web/20090107022333/http://casmsite.org/ World Bank: CASM Initiative]
* [https://web.archive.org/web/20070225121732/http://www.gemstone.org/gem-by-gem/english/emerald.html]
* http://www.mindat.org/min-1375.html
* https://web.archive.org/web/20070712113123/http://mineral.galleries.com/minerals/gemstone/emerald/emerald.htm
 
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