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| Dr. Victor Miguel Ponce |
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| Rio Teposcolula (2003). |
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| Oxidation pond near Rio Teposcolula (2003). |
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| Visit to oxidation pond near Rio Teposcolula (2003). |
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| Visit to Ojo de Agua I (Spring I) in Teposcolula (2003). |
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| Visit to Ojo de Agua II (Spring II) in Teposcolula (2003). |
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