Excerpt from The Mineral Deposits of South America We wish to express our thanks to Prof. Tulio Ospina for a critical reading of the manuscript for the Colombia

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

This book has been considered by academicians and scholars of great significance and value to literature. This forms a part of the knowledge base for future gen