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![](./images/clear.gif) 1.- NEW DATA ON UPPER ORDOVICIAN RADIOLARIANS FROM THE GORNY ALTAI (SW SIBERIA, RUSSIA)
INSTITUTO GEOLOGICO DE ESPAÑA; MADRID; ESP, 2011
ORDOVICIAN OF THE WORLS
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![](./images/clear.gif) 2.- ORDOVICIAN REGIONAL CHRONOSTRATIGRAPHIC SCHEME OF THE GORNY ALTAI
INSTITUTO GEOLOGICO DE ESPAÑA; MADRID; ESP, 2011
ORDOVICIAN OF THE WORLS
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