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Document Designation and Title Year Select Item(s) D4491 Standard Test Methods for Water Permeability of Geotextiles by Permittivity 99a(2004)e1 D4491 Standard Test Methods for Water Permeability of Geotextiles by Permittivity 99a(2004) D4491 Standard Test Methods for Water Permeability of Geotextiles by Permittivity 99a