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Las Actividades Productivas Y Su relaciĆ³n Con La contaminaciĆ³n Del Agua De La Microcuenca Negroyacu, En Guaranda, Ecuador. The Productive Activities and Their Relation With the Water Pollution of the Negroyacu Microcuenca, in Guaranda, Ecuador. CU 2017, 10 (22), 88-97. https://doi.org/10.29076/issn.2528-7737vol10iss22.2017pp88-97p.