An automated vacuum extraction control system for soil water percolation samplersLentz, R.D. and Kincaid, D.C. (2003) An automated vacuum extraction control system for soil water percolation samplers. Soil Science Society of America Journal. 67:100-106. (Un Sistema de Control de Extracción con Vacío Automatizado para muestreadotes de Precolación del Agua del Suelo)
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