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Der Vorlauf an Lagerstättenvorräten mineralischer Rohstoffe. Eine geologisch-okonomische Kategorie. (L'évolution des réserves des minerais. Un problème d'économie géologique)
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can be considered from a global regional and local point of view. Its characteristic values are determined as a statistical index of constant annual output, or as a dynamic index of annually increasing output. The reason given for the determination