International Organization for Standardization (ISO)
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ISO 9195:1992
Scope
Applies to surface and subsurface material having diameters of 2 mm and over. Two sampling techniques are applicable: one is to collect a definable in situ volume of material which is subsequently dealt with as a bulk sample, the second is to sample material from the surface, using one of several procedures.
ISO 9195:1992 history
1992ISO 9195:1992 Liquid flow measurement in open channels; sampling and analysis of gravel-bed material