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Cover for Mr. Ricardo A Valls · The Geology and Mineral Resources of Northern Haiti. (Paperback Book) (2016)

The Geology and Mineral Resource... (2016)

Mr. Ricardo A Valls

Cover for Mr. Ricardo A Valls · The Geology and Gold Potential of the Motagua Basin in Guatemala, Central Americ (Paperback Book) (2016)

The Geology and Gold Potential o... (2016)

Mr. Ricardo A Valls

Cover for Mr. Ricardo A Valls · Geochemical Evolution of Guatemala?s Ophiolitic Belts (Paperback Book) (2016)

Geochemical Evolution of Guatema... (2016)

Mr. Ricardo A Valls