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• Harder, L. F.; Seed, H. B.
  Determination of Penetration Resistance for Coarse-Grained Soils Using the Becker Hammer Drill.
  National Science Foundation, Washington, DC., May 1986, 148 p.
  Identifying Number(s): UCB/EERC-86/06
  Keywords: ; Gravel; Penetration; Measuring instruments; Tests; Sand; Soils; Earthquakes; Data processing; Resistance; Drilling machines (Tools); Standards