TY - BOOK ED - American water works association, Denver, Colo.^pUS ED - Water pollution control federation, Washington, D.C.^pUS TI - Standard methods for the examination of water and wastewater: : Selected analytical methods approved and cited by the United States environmental protection agency SN - 087553094X PY - 1981/// CY - Washington: PB - APHA, KW - AGUA KW - INIST KW - AGUAS RESIDUALES KW - PROTECCIÓN KW - MEDIO AMBIENTE KW - INFORME DE IMPACTO AMBIENTAL N1 - Prepared and published by: APHA, AWWA, WPCF; Suplemento de: 'Standard methods for the examination of water and wastewater'; Impreso a dos columnas; Notas de pie de página; Bibliografía al final de cada tema ER -