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Ricardo a Valls

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La Investigación Científica en la Geología y en otras Ciencias de La Tierra by Ricardo a Valls
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Geology and Geochemical Evolution of the Ophiolitic Belts in Guatemala. by Ricardo a Valls
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Geochemical Evolution of Guatemala's Ophiolitic Belts by Ricardo a Valls
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Geochemical Evolution of Guatemala's Ophiolitic Belts
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The Geology and Mineral Resources of Northern Haiti. by Ricardo a Valls
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The Geology and Mineral Resources of Northern Haiti.
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The Geology and Gold Potential of the Motagua Basin in Guatemala, Central Americ by Ricardo a Valls
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