2009BS ISO 5667-11:2009 Water quality. Sampling. Guidance on sampling of groundwaters
1993BS 6068-6.11:1993 Water quality - Sampling - Guidance on sampling of groundwaters
BS ISO 5667-11:2009 Water quality. Sampling. Guidance on sampling of groundwaters has been changed from BS 6068-6.11:1993 Water quality - Sampling - Guidance on sampling of groundwaters.