Unpublished manuscript by Djalma Guimarães, in which he points out the relevance of the Barreiro deposit in Araxá. It is the "birth certificate" of niobium's presence in Araxá, Brazil. 1953.
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Details
Title: Manuscript made by Djalma Guimarães
Creator: Djalma Guimarães
Rights: MM Gerdau - Museu das Minas e do Metal
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