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Fluorite.fr : Etienne Guillou Gotkovsky, le monde de la fluorine, gisements, histoire, mineralisations et donnees techniques, collections
www.fluorite.fr - 2009-02-13
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Multiaxes : fine minerals for collectors and museums - Gilles Emringer's selection
Emringer  Gilles Emringer 
www.multiaxes.com - 2009-02-10
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