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Bulgaria | |
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| Kievlenko, Eugenii Ya., Soregaroli, A. - Ed. (2003) Geology of Gems - First English Edition. Ocean Pictures Ltd, Littleton, Colorado. p.1-468. |
| (2002) Emeralds of the World. extraLapis English 2. Lapis International LLC |
Huhla, Ivaylovgrad, Ivaylovgrad Municipality, Haskovo Province, Bulgaria