Colombie (1) Origin (1) Water resources development (1) Water quality (1) Swine (1) Sewage (1) Sanitation (1) Sand (1) Rural population (1) Runoff (1) Quality of products (1) Pollution (1) Pesticides (1) Oxidation (1) Mineral industries (1) Mass spectrometry (1) Irrigation (1) Gas chromatography (1) Fountains (1) Evaluation (1) Consumption (Economics) (1) Attention (1) Attachment and garnishment (1) Agriculture (1) Agua--Calidad (1) Escorrentía (1) Origen (1) Población rural (1) Arena (1) Evaluación (1)