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GMGA – Grupo de Mineralogia e Geoquímica Aplicada – 04 – MINERALOGICAL AND TEXTURAL CHARACTERISTICS OF GRAÇA CHALCEDONY IN PALEOZOIC SEDIMENTARY ROCKS OF PARNAÍBA BASIN (STATE OF MARANHÃO, BRAZIL)
The Government of Orissa laid special interest on the exploration of the manga- nese belt in the Koraput district during its sec
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