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Document Designation and Title Year Select Item(s) D2168 Standard Test Methods for Calibration of Laboratory Mechanical-Rammer Soil Compactors 02a D2168 Standard Test Methods for Calibration of Laboratory Mechanical-Rammer Soil Compactors 02 D2168 Standard Test Methods for Calibration of Laboratory Mechanical-Rammer Soil Compactors 90(1996)e1