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1.- COLOUR IN TOPAZES FROM RHYOLITE DOMES OF THE SAN LUIS POTOSI VOLCANIC FIELD, MEXICO
GEMMOLOGICAL ASSOCIATION AND GEM TESTING LABORATORY OF GREAT BRITIAN; LONDON; GBR; UNITED KINGDOM, 1998
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2.- THE TOPAZ-BEARING RHYOLITES FROM THE SAN LUIS POTOSI AREA (MEXICO); CHARACTERISTICS OF THE LAVA AND GROWTH CONDITIONS OF TOPAZ
SOCIETE GEOLOGIQUE DE FRANCE; PARIS; FRA; FRANCE, 2002
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